Smalling suffered the injury in training before the clash with rivals Liverpool at the weekend.
Nemanja Vidic is set to feature alongside Phil Jones for the clash with Olympiakos.
Rio Ferdinand could be set for a recall to the United team for the clash with Manchester City, as Vidic is banned for boths the clash with City and against West Ham.
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Being an amiable guy is good for you and Jurgen Klopp is living proof.
Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.