Lille threatened to walk off the pitch during the game, but the Dutch goalkeeper says there are no problems with the goal that was scored.
Van der Sar said: “It is obvious as a keeper you have to be aware of situations like that.
“The rules are the same everywhere. If a player asks the referee if he can take a quick free-kick, he can take it.
“We have seen this kind of thing happen all over Europe and Ryan showed good imagination by taking advantage of the situation.
“As a keeper, that kind of thing will probably happen to you once in your career. It was a good time for it to happen in our favour.”