The Twins selected Keirsey's contract from Triple-A St. Paul on Thursday, Bobby Nightengale of the Minneapolis Star Tribune reports.
Keirsey, 27, has slashed .292/.363/.477 with 14 homers and 36 stolen bases with St. Paul this season. Speed and center field defense are his best assets, and it's possible Keirsey could see some action in center with Byron Buxton's hip injury lingering. He will be making his major-league debut when/if he gets into a game.