Alonso (knee) will be out until at least Saturday's game against the Red Sox, Jane Lee of MLB.com reports.

Although Alonso told reporters Thursday that his knee is feeling "a lot better," the A's will still be cautious with their slugger. The A's will likely plug the right-handed Ryon Healy in at first base for the next two days with the Red Sox turning to a string of lefties in their rotation for the rest of the series. Alonso is hitting just .167 against left-handers this season. Look for Alonso to get back into the lineup as soon as Saturday, but that'll depend on how his knee responds to treatment in the coming days.

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