FC Sion coach Paolo Tremezzani has warned AC Milan facing Tottenham striker Heung-min Son.
Milan have drawn Spurs in the Champions League round of 16.
Former Tottenham defender Tremezzani told La Gazzetta dello Sport: "My favourite is Son. If you ask me who are my five favorites in the world, he is there.
"I like how he plays the role of forward, how he chooses when to attack the depth, when to open up, when to be found in the area: to mark him, you have to go and look for him.
"And then, when he accelerates, he does not lose quality."