The 34-year-old Brazilian was carried off on a stretcher after an incident involving a Celtic fan who ran onto the pitch following Scott McDonald's injury-time winner.

UEFA have opened disciplinary proceedings against Celtic on charges of lack of organisation and improper conduct of supporters during last Wednesday's game, but also revealed they are investigating Dida's part in proceedings.

Lennon, who signed for Nottingham Forest in the summer after seven years at Parkhead, was back at Celtic to watch the game against the Serie A giants.

And he added to the condemnation of the Milan 'keeper whose over-the-top reaction to the supporter's actions could see him punished.

Lennon said: "It was inexcusable for the fan to come on.

"I knew the guy hadn't made contact and there was no punches thrown.

"He was overcome with joy I suppose at the result.

"But Dida didn't cover himself in joy and basically he tried to get Celtic in trouble.

"Celtic will get punished but Dida needs to have a long, hard look at himself.

"AC Milan didn't want to take it any further but for it to be taken out of their hands, UEFA will have to decide themselves.

"The whole of Europe has seen it so he has embarrassed himself more than anybody else.

"It took the gloss off what should have been a great night for Celtic."

The case against Dida and Milan, who are also being investigated, will be heard on Thursday by UEFA's disciplinary committee, who will also make a decision on the charges against Celtic on the same day.

Lennon, 36, was in Glasgow today to speak at a conference to launch findings from a Scottish Recovery Work report on mental health problems. The former Northern Ireland international is a sufferer from depression himself.

Lennon admits he will sorely miss the Old Firm clash, coming up on Saturday week at Ibrox, despite the stick he used to take from the Rangers fans when he travelled across the city.

With Celtic looking to win their third SPL title in a row, Lennon admits it was time his old rivals fought back.

He said: "I quite enjoyed the Rangers fans being on my back.

"It was all part of being up here and part of the fabric of making the Old Firm so special.

"That game is really going to shape what happens in the next couple of months.

"That will be a big psychological barrier for both teams.

"Rangers had to turn the corner.

"They haven't won the league for the last two seasons and have been a long way behind Celtic.

"Walter Smith has brought in a lot of physical players but they can play.

"That was an absolutely stunning victory in Lyon in the Champions League last week.

"But as far as the SPL title goes, it is going to boil down to the Old Firm games this season."

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Celtic chairman Brian Quinn, who, in the immediate aftermath of the game, urged UEFA to investigate the "antics" of Dida, distanced himself from the governing body's decision.

He said: "I don't have a view. UEFA have decided to do what they have decided to do.

"We are quite happy to co-operate fully with UEFA.

"We will submit any information that they ask us to submit and we wait patiently for the verdict."