Milan team manager Umberto Gandini said: "It's difficult to understand what happened, but whatever did happen did not influence the final result. It's been an ill-fated incident, we do not have anything to say against anybody from Celtic.
"It was only a moment of madness from a single person. Dida has received a blow to the neck and now we want to close the argument as soon as possible.
"He will be available for the next game of the championship against Lazio."