"Oh, absolutely," Gardenhire said when asked if it will be a tough call. "It means both of them are doing OK, so when Joe comes back, sure, we'll have a tough decision. They've both done their parts and they continue to, so it won't be easy no matter which way we go."
Both Rivera and Butera have been swinging the bat well lately, having combined for a .319 batting average over the last 14 games entering Sunday's series finale against the Rangers.
"We've kind of had a good system," Gardenhire said. "We've gotten good production from both of our catchers, kind of mixing and matching [them]. Both of them have been swinging better."
Rivera, who is hitting .208 with a .276 on-base percentage, got the start on Sunday, with Butera, batting .174 with a .207 on-base percentage, on the bench.