Thomas, who is filling in for Aaron Hicks in center field with Hicks on the 15-day disabled list with a strained left hamstring, entered Saturday's game hitting .273 with a .304 on-base percentage in eight games.
"He's been having good at-bats," Twins manager Ron Gardenhire said. "Right now we're kind of desperate and looking for somebody to give us quality at-bats. He's been swinging the bat good, and so you take your chance."
Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.