Mauer played catch and hit off a batting tee Wednesday, but it's unclear when he'll be able to play.
The Twins have been playing short-handed throughout their four-game series with the Indians and their lack of depth became a bigger problem when outfielder Sam Fuld couldn't play Thursday because of headaches. Gardenhire said Fuld was being checked for a possible concussion.
The injuries left infielder Pedro Florimon as Minnesota's only player on the bench.
Eduardo Escobar, normally a shortstop, had to play left field Wednesday. He misjudged a fly ball in the ninth inning that led to Cleveland scoring the winning run in a 4-3 loss. Escobar started in center Thursday.
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