Atletico Madrid s Luis Suarez scores on penalty kick during the Champions League group B soccer match between AC Milan and Atletico Madrid at the San Siro stadium in Milan, Italy, Tuesday, Sept. 28, 2021. AP
Griezmann leveled six minutes from time and Atletico was awarded a penalty that Suarez struck confidently down the middle.
Milan was forced to play for an hour with 10 men after midfielder Franck Kessie was sent off for a second bookable offense. That came shortly after Rafael Leao had given the Italian squad the lead in the 20th minute.
Atletico remained second in Group B, two points behind Liverpool after the English team beat Porto 5-1. Milan is last with zero points from its opening two matches.
It was Milan's first home match in the Champions League in more than seven years _ when it lost 1-0 at San Siro to coincidentally the same opponent in the round of 16.
The Rossoneri fans were in fine voice and had plenty to cheer about as Milan got off to an aggressive start and Atletico struggled to deal with its opponent's energy and dynamism.
Brahim Diaz was at the heart of most of Milan's attacks and the young midfielder, who is on loan from Real Madrid, came close to giving the Rossoneri the lead in the 17th minute but fired straight at Atletico goalkeeper Jan Oblak.
Ante Rebic went even closer two minutes later when he was sent clear by Diaz and had only the goalkeeper to beat but Oblak managed to push his effort wide.
Milan did take the lead moments later following another good move by Diaz, who then laid it off to Leao and the forward took one touch before driving it into the bottom left corner.
The closest Atletico came in the opening half hour was when former Inter Milan midfielder Geoffrey Kondogbia blasted an effort high over the crossbar from a good position.
But disaster struck when Kessie received a somewhat harsh second booking and was sent off.
Milan almost doubled its lead in spectacular fashion as Leao attempted an overhead kick from distance and his effort crashed off the underside of the crossbar.
Atletico went close with the last kick of the half as Suarez volleyed wide from nine yards out.
The Spanish team hadn't scored in its past three matches in the competition and its struggles in front of goal continued in the second period, with Kondogbia and Suarez sending further attempts wide from good positions.
Diaz continued to be a thorn in Atletico's side, even dribbling the ball out from defense on one occasion, and the 22-year-old got a standing ovation from the fans when he limped off in the 57th after sustaining a knock.
Atletico laid siege to the Milan goal and finally recorded its first shot on target 13 minutes from time when a Thomas Lemar snapshot from distance was beaten away by Mike Maignan.
And it took the lead shortly after as a cross was headed back across goal by Renan Lodi and Griezmann was there to volley it into the bottom left corner.
The comeback was complete when Pierre Kalulu was whistled for a handball and Suarez did the rest.
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