The Champions League final will take place at Atletico Madrid's Wanda Metropolitano stadium on 1 June
It's back. The Champions League returns after a two-month absence, with 16 teams still left standing.
All four English sides - Manchester United, Tottenham, Liverpool and Manchester City - made it through their respective groups.
But when do they play and how much do you know about the teams they will be facing for a place in the quarter-finals?
BBC Sport tells you all you need to know about the return of Europe's premier club competition.
Champions League last-16 ties
Teams First leg Second leg
Manchester United v Paris St-Germain Tuesday, 12 February Wednesday, 6 March
Roma v Porto Tuesday, 12 February Wednesday, 6 March
Ajax v Real Madrid Wednesday, 13 February Tuesday, 5 March
Tottenham v Borussia Dortmund Wednesday, 13 February Tuesday, 5 March
Liverpool v Bayern Munich Tuesday, 19 February Wednesday, 13 March
Lyon v Barcelona Tuesday, 19 February Wednesday, 13 March
Atletico Madrid v Juventus Wednesday, 20 February Tuesday, 12 March
Schalke v Manchester City Wednesday, 20 February Tuesday, 12 March
Manchester United v Paris St-Germain
First leg: Old Trafford (Tuesday, 12 February). Second leg: Parc des Princes (Wednesday, 6 March).
How they qualified: United finished second in Group H behind Italian champions Juventus, winning three of their six matches, all under the guidance of former manager Jose Mourinho. Now managed by former striker Ole Gunnar Solskjaer, the Red Devils are unbeaten in 11 games.
Paris St-Germain finished top of Group C, above Liverpool. No team scored more in the Champions League group phase than PSG, with 17 goals in six games. Neymar scored five of them and Kylian Mbappe netted three times.
PSG boss: German Thomas Tuchel is the current PSG head coach after former manager Unai Emery left to join Arsenal at the end of last season. Tuchel took former club Borussia Dortmund to the Champions League quarter-finals in 2016-17, before losing 6-3 on aggregate to Monaco.
PSG's Champions League record: PSG reached the semi-finals of the Champions League in 1994-95, but since then have never made it past the quarter-final phase. They went out in the last eight four years in a row from 2013 to 2016, but have been eliminated in the last 16 in both of the past two seasons.
PSG's star players: Brazil forward Neymar will miss both games because of a broken metatarsal, with PSG's all-time top scorer Edinson Cavani a doubt with a thigh injury. They should still be able to call on France World Cup winner Mbappe.
European football expert Julien Laurens: "It's a far more balanced tie than when the draw was made in December. It's more 50-50 than United being favourites - especially with the second leg in Paris."
Kylian Mbappe (left), Neymar (centre) and Edinson CavaniTottenham Hotspur v Borussia Dortmund
First leg: Wembley (Wednesday, 13 February). Second leg: Signal Iduna Park (Tuesday, 5 March).
How they qualified: Faced with a tough group, Spurs came through in second place, thanks to a superb run of results in the second half of the campaign. With just one point after three games, Mauricio Pochettino's side defeated PSV and Inter Milan at home before claiming a gutsy point at group winners Barcelona to edge out the Italian side.
Bundesliga leaders Dortmund finished top of Group A courtesy of a better head-to-head record against Atletico Madrid after both teams finished on 13 points. Dortmund won the home game 4-0, and lost 2-0 in the return match in Spain - the only two goals they conceded in the group phase. Atletico would have topped the group if they had won their final group match, but could only draw 0-0 at Belgian side Brugge.
Dortmund's boss: Former Switzerland midfielder Lucien Favre signed a two-year contract at Dortmund when he became the club's boss last summer. His sides are attack-minded and after 21 Bundesliga matches had scored 54 goals - more than any other team in the German top division. The game at Wembley will be the first time Favre, who has also been in charge of Zurich, Hertha Berlin, Borussia Monchengladbach and Nice, will have managed a side in a Champions League knockout game.
Dortmund's Champions League record: Dortmund won the Champions League in 1996-97 when they beat Juventus 3-1 in the final in Munich. Since then, the closest they have come was in 2012-13 when their side, managed by Jurgen Klopp, lost 2-1 to Bayern Munich in the Wembley final. Dortmund have not reached the semi-finals since then and went out in the group phase last season.
Dortmund's star players: Germany striker Marco Reus and Spain forward Paco Alcacer are their main goal threats, with England winger Jadon Sancho and United States wide player Christian Pulisic, who will be joining Chelsea next season, also in their squad.
European football expert Julien Laurens: "No Harry Kane, no Dele Alli but Spurs seem to be ok without Kane because Son Heung-min is in the form of his life. It's going to be fascinating.
"A lot of people see Borussia Dortmund as favourites. They've been so good in the Bundesliga this season and have such an exciting style of play. The two games are going to be incredible."
Jadon Sancho has played three times for England since joining Borussia Dortmund in 2017Liverpool v Bayern Munich
First leg: Anfield (Tuesday, 19 February). Second leg: Allianz Arena (Wednesday, 13 March).
How they qualified: The Reds started their campaign with an encouraging 3-2 win over PSG, but ended it scraping through in second place thanks to a 1-0 victory in a straight shoot-out for second place with Italian side Napoli. With three wins and three losses, it represented a frustratingly inconsistent but ultimately satisfactory effort from last season's beaten finalists.
Bayern finished top of Group E, with their only dropped points coming in two draws with Ajax. It was a thrilling conclusion to the group as Ajax entertained Bayern in the final group game in Amsterdam. Ajax would have topped the group with a win and were 2-1 ahead in the 87th minute, before it finished 3-3 in a thrilling conclusion.
Bayern's boss: Former Bayern midfielder Niko Kovac became the club's manager in the summer, winning 5-0 against Eintracht Frankfurt to clinch the German Super Cup in his first game in charge. Kovac, who managed Croatia at the 2014 World Cup when they went out in the group phase, has also managed Red Bull Salzburg and Eintracht Frankfurt.
Bayern's Champions League record: Bayern have won the Champions League twice - beating Valencia 5-4 on penalties after a 1-1 draw in the 2001 final and defeating fellow German side Dortmund 2-1 in 2013. The reigning German champions also won the European Cup three times - in 1974, 1975 and 1976. This is the eighth successive season where Bayern have reached at least the quarter-finals of the Champions League.
Bayern's star players: Robert Lewandowski is the top goalscorer in the 2018-19 Champions League with eight goals, with their squad also including goalkeeper Manuel Neuer and Colombia midfielder James Rodriguez, the Golden Boot winner at the 2014 World Cup. Forward Thomas Muller will miss both games against the Reds as he is suspended following a red card in their final group match.
Robert Lewandowski scored two of his eight Champions League goals this season in the dramatic 3-3 draw with Ajax that saw Bayern top the groupSchalke v Manchester City
First leg: Veltins-Arena (Wednesday, 20 February). Second leg: Etihad Stadium (Tuesday, 12 March).
How they qualified: It started terribly for City courtesy of a 2-1 home loss to French side Lyon, but four wins and a draw (including a 6-0 demolition of Shakhtar Donetsk) from the remainder of their Group F matches saw Pep Guardiola's side comfortably into the last 16.
Schalke only scored six goals in their six Group D matches, but still managed to finish second behind leaders Porto and above Galatasaray and Lokomotiv Moscow. Their two 1-0 wins over Lokomotiv both came with winning goals scored in the last two minutes of the match.
Schalke's boss: Italian-born Domenico Tedesco is only 33 and has been in charge of Schalke since 2017, finishing second in the Bundesliga, behind champions Bayern Munich, in his first season at the club.
Schalke's Champions League record: Schalke's best run in the Champions League came in 2010-11 when they reached the semi-finals, losing 6-1 on aggregate to Manchester United, who were beaten 3-1 by Barcelona in the final. Schalke did not qualify for the Champions League in the past three years.
Schalke's star players: Schalke have struggled in this season's Bundesliga and their squad includes former Tottenham midfielder Nabil Bentaleb, ex-Cardiff striker Guido Burgstaller and Germany forward Mark Uth.
Schalke players celebrate scoring a late winner in their Champions League game against Lokomotiv Moscow in December
Source: bbc.com