Ibra felt pain in his Achilles tendon during training today.
Ibrahimovic just returned from four months out with a knee injury on Sunday.
And he celebrated his comeback by scoring in Milan's 2-0 victory against Lazio.
That made him Serie A's oldest foreign goalscorer.
However, the much-loved forward will not be able to add to his tally against Jurgen Klopp's side, according to reporter Fabrizio Romano.
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