MINNEAPOLIS -- Kansas City placed Tony Pena Jr. on the 15-day disabled list on Sunday with a fractured bone in his left hand.
To fill Pena's spot, the Royals promoted infielder Luis Hernandez from Triple-A Omaha.
Pena fractured his left hamate bone Saturday against Minnesota, but remained in the game.
Hernandez was a non-roster invitee to spring training after spending the last two seasons in the Baltimore Orioles organization. He played 66 games in the majors with the Orioles in 2007-08.
Hernandez hit .292 in 20 games this season for Omaha, with eight runs, three doubles and 13 RBIs.
"He's been hitting pretty good," Royals manager Trey Hillman said before Sunday's game against the Twins. "From my understanding, he's been playing well. He gives us another switch hitter, which never hurts. He's got a little bit of experience."