Although Olic's 92nd-minute strike has given Bayern a one-goal lead, Van Gaal bemoaned the fact that his side travel to Manchester in a week's time having conceded an away goal at the Allianz Arena.
Nevertheless, he is optimistic that his side will also be able to find the back of the net at least once at Old Trafford.
"I think that Man United has a great chance because they have scored a goal away from home," he said. "I had not accounted for that; I wanted a 0-0 or a 1-0 and 2-1 is not the best result.
"But we have always scored at least a goal in the Champions League I think.