The struggles have come since being hit above the left knee by a foul tip on April 29, but Gardenhire said Mauer's knee is just fine. He was back behind the plate on Friday for the first time since Monday.
And Gardenhire also said he doesn't believe that Toronto's aggressive shifts in the infield have any effect on Mauer, as he went 0-for-3 in Thursday's 6-2 loss.
"I don't think so," Gardenhire said. "Joe goes up there with a pretty good plan of what he's going to do. I don't think he goes up there and tries to change the way he's hitting. He's always going to try to get the barrel to the ball and wherever it goes, it goes. He just rolled over a couple pitches last night."
Gardenhire, though, said that Ryan Doumit appeared to be affected by the infield shift by the Blue Jays, as he tried to bunt multiple times and ended up going 0-for-4.
"I think you saw a really big shift on him for the first time and he was trying to drop bunts down, but that's out of his element," Gardenhire said. "It's good to be able to do that every once in a while to move them back around, but it got him out of his element."