The 36-year-old missed the first leg—an electrifying 3–3 draw—after suffering the injury during a Spanish La Liga match on April 19.
Despite being sidelined for more than two weeks, he remains the top scorer in Spain's top flight this season, with 25 goals for Barcelona—one more than Real Madrid's Kylian Mbappé.
Polish referee Szymon Marciniak is set to officiate Tuesday's high-stakes clash in Milan.
Meanwhile, Lewandowski has slipped to third in the race for the 2024/2025 European Golden Shoe, awarded to the top scorer across Europe's major leagues.
Sporting Lisbon's Viktor Gyökeres leads the competition with 38 goals in Portugal, followed by Liverpool's Mohamed Salah with 28 in the Premier League.
Lewandowski won the European Golden Shoe in 2021 and 2022.
In the 2021/2022 season, he scored 35 goals for German heavyweights Bayern Munich, finishing as Europe’s top scorer.
In January 2022, the Polish star was named world soccer governing body FIFA’s Best Men's Player for 2021, beating Argentina's Lionel Messi and Egypt's Salah.
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Source: PAP