Mauer left Sunday's game for a pinch-runner in the seventh inning after Weeks' kneed him in his quad in a collision in the second inning. He said he's feeling better, and can serve as a pinch-hitter, but still can't run.
"I'll probably need a runner," Mauer said. "It's made big improvements from yesterday to today. That's encouraging; hopefully it continues to do that."
There's still no timetable for Mauer's return, as Twins manager Ron Gardenhire said, he remains day to day.
"I can't tell you how long it's going to last," Gardenhire said. "It's up to him and how he feels. Obviously, he went out there today and tried to stretch around and he's still pretty beat up. He's doing all the work it takes to get back on the field right now; his body's just not letting him do it."
With Mauer out, Ryan Doumit was behind the plate against his former club on Tuesday.