The Red Devils only managed a 0-0 draw at Sunderland.
Van der Sar said: “We were happy to go in at half-time with a 0-0. In the last 15 minutes we had one or two chances, but not enough to get the winner.
“I don’t think we put enough in our offensive game to really claim the three points. I don’t think the service was sufficient to get the goal in the end.
“We can be happy that we had a clean sheet, the second in a row after Valencia on Wednesday, but I think it was two dropped points, because we dropped too many already in away games.
“We were disappointed with a draw at Bolton, we got a nice win in Valencia which sets us well for the Champions League and of course today, you are looking for a win to close the gap a little bit.”