The Uruguay striker Cavani picked up the knock in training in the build-up to Saturday’s 4-1 win over Newcastle.
Ole Gunnar Solskjaer says Cavani will be sidelined for a “week or so”.
Nineteen-year-old Anthony Elanga is included in the 22-man squad,
alongside 21-year-old goalkeeper Matej Kovar.
Portugal forward Ronaldo, has been named in the squad for his first Champions League trip with the Reds since featuring in the 2009 final.
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Manchester United travelling squad
De Gea, Heaton, Kovar, Bailly, Dalot, Lindelof, Maguire, Shaw, Varane, Wan-Bissaka; Fernandes, Fred, Lingard, Mata, Matic, Pogba, Sancho, Van de Beek; Elanga, Greenwood, Martial, Ronaldo.
