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The Serie A champions, pegged back at 1-1 at Spezia when the 35-year-old entered the fray, scored three times in 20 minutes after his arrival as they went second in the table.
London sides Tottenham Hotspur and Arsenal made winning starts as did fellow Premier League club Leicester City.
European champions Bayern signed right-back Bouna Sarr from Olympique de Marseille and brought back Brazilian winger Douglas Costa on loan from Juventus.
A fired-up Lionel Messi led Barcelona to a 3-1 win at home to Napoli for a 4-2 aggregate victory.
The sacking follows the team's elimination from the Champions League in the round of 16 on Friday.
Late goal by Real Sociedad substitute Adnan Januzaj secured a 1-1 draw at Atletico Madrid as they finished sixth to seal a Europa League spot.
The Champions League will resume in August after being halted in March due to the COVID-19 pandemic with a Final Eight tournament being held in Lisbon after the remaining second-leg games from the last 16 ties are decided.
Juventus, with 66 points from 27 games and chasing a ninth successive title, extended their lead to four points over Lazio, who visit Atalanta on Wednesday.
Paulo Dybala and Danilo missed Juve's first two efforts in the shootout while Napoli converted all their attempts to win the trophy for the sixth time.
The quarterfinals and semifinals will be staged over one leg, instead of the usual two, with the final to be held on August 23.