Tottenham boss Jose Mourinho questioned his players' mental strength after a 3-1 defeat at Bramall Lane left their fading Champions League hopes in tatters.
The North London club sit a lowly ninth in the Premier League table and a distant nine points off Chelsea in fourth place with just six fixtures remaining.
Sander Berge opened his account for the Blades after his record signing fired home an angled drive from a Chris Basham cut-back.
Tottenham thought they'd leveled soon after but Harry Kane's low strike was ruled out when VAR adjudged that Lucas Moura used his hand in the build-up, despite the Brazilian being fouled in the process.
The visitors never recovered and further goals from Lys Mousset and Oli McBurnie put the Blades on easy street before Kane did eventually get on the scoresheet with a late consolation.
Mourinho believed the VAR decision was ultimately crucial to his side's fortunes.
"I thought at that stage that it is game over," said the Portuguese. My players were not mentally strong enough to cope with that disappointment.
"They have to be. So I'm not going to say that all is the cause of everything because it would be very easy for me to do that.
"In the second half we didn't try with try with that conviction, with that real desire, with that real belief that we could change the game but we still had 45 minutes to change the game."
Sheffield United jumped above Spurs with this result and move closer to European qualification for the first time in their history.
By Russell Stoddart
Image: Getty Image