Sunderland boss Ricky Sbragia said a lack of defensive discipline cost his side as Robbie Keane grabbed a late equaliser on Saturday.
The Black Cats led via Kieran Richardson's early goal but we dominated after that and finally levelled when Keano buried Darren Bent's cross in the final minute.
Sbragia said: "Eighty-nine minutes, we were 1-0 up and it was the same old story.
"We got carried away and we start losing our discipline. We should take a short corner kick and try to see out a little bit of time or try to work it a little bit better.
"The left-back is in the box for some reason - I don't know why he is there, but he's there, and that's where the goal has come from. I can't understand that.
"We didn't play particularly well and Tottenham dictated the tempo of the game.
"We got off to a good start but for some reason we don't have the belief when we go ahead. We sat back and let them dictate it.
"Tottenham threw caution to the wind, they changed their system, they were chasing the game and we rode our luck.
"But we kept them at bay and then, for some reason, we shot ourselves in the foot. We should have seen the game out and we didn't - it's just disappointing."