"I know at his level, 11 against 10, it's almost impossible,'' he said on Sky Sports Two.
''It's just a question of the team with 11 keeping concentrated and we did that in the second half, not in the first half but in the second half we did that.
''For a team with 10 men for such a long time is an impossible mission I feel sorry because with 11 against 11 the match would be much better.''
Mourinho said, though, Tottenham were still alive in the tie.
He said: ''I know English football well, I know the English mentality. In another culture, yes, but with the English concept of football it's not over.''