Tottenham boss Ryan Mason admitted he was 'shocked' by a 'wrong' decision to rule out a goal from Harry Kane for offside in his team's 3-1 defeat at Leeds.
Spurs talisman Kane looked to have neatly dinked the visitors into the lead at Elland Road but his effort was chalked off by the raised flag of the linesman.
Replays on the VAR screen showed Kane appearing to be level with the backtracking Leeds defenders but, despite this, the goal was not allowed to stand.
The controversial moment proved even more chastening for Champions League chasers Tottenham after Marcelo Bielsa's side rallied to claim all three points.
And during his post-match interview with BT Sport, a clearly-irked Mason did not hold back in expressing his frustration.
'I think at 1-1, there was an offside decision and I'm shocked,' Mason said. 'I can't believe it was given as offside to be perfectly honest.
'I don't think people understand the momentum and the shift that decisions like that can have in games of football. At 2-1, it's a completely different game.
'I see it. I think when the line goes back towards the striker, surely that would indicate his foot isn't over the yellow line, the offside line.
'My first look, my second look and my tenth look tell me it's not an offside decision. I don't know what people in the game think about it, but I'm pretty sure.
'At 1-1, it's a big moment. It's a big moment in the momentum and the whole shift of the game. In my opinion they got that one wrong.'
With Kane's goal ruled out, Tottenham struggled to respond and Patrick Bamford slotted home to restore Leeds' advantage just before the half-time interval.
The mountain that Mason's charges must now climb became even steeper on 84 minutes when Rodrigo finished off the hosts' third of the afternoon.
The defeat has all but ended Tottenham's already thin hopes of clawing back into fourth spot and likely leaves them facing Europa League football again next term.
Leeds delivered an impressive showing and edged in front through Stuart Dallas after poor defending from Tottenham - before Son Heung-min stroked in for 1-1.
Tottenham are now five points adrift of fourth-placed Chelsea and rookie coach Mason was left to rue a number of missed chances in Yorkshire.
'We had moments but we weren't clinical enough,' added Mason. 'Leeds know what they're doing, they play a certain way and it took us a while to adjust to that.
'In the second half we were the better team. The moments we had, you have to take them in these games.
'Today was a massive game for us, to lose it hurts. It's difficult to win in the Premier League but we've got to have our full attention on next week now.'