Tolleson has reported to Triple-A Omaha.
"We were just looking for depth in the infield," Royals assistant general manager J.J. Picollo said. "We had Cheslor Cuthbert and Whit Merrifield go up the big-league club, and Clint Barmes retired, so we needed infielders."
The same theory explained the signing of Beimel, 39.
Omaha had started the season with left-handers Brian Duensing and David Huff in the bullpen, both of whom have since moved on. So that created a need for Beimel, who is presently in Arizona and will throw a couple of outings there before heading for Omaha.