Tanguy Ndombele scored a spectacular goal as Tottenham claimed a 3-1 win over Sheffield United.
Serge Aurier broke the deadlock after five minutes when he headed home Son Heung-min's corner.
The Blades got back into the game when David McGoldrick scored a glancing header.
But Ndombele restored Spurs' two-goal advantage hit a brilliant lob over Ramsdale.
"The performance was good," Mourinho said after the game. "The team was very dominant, created enough chances to kill game in the first half.
"In the second half, the intention was the same. A very basic mistake, very basic, gave them the goal with the only chance they had, but then we had a genius action to bring us again to a two-goal advantage."