Betancourt was designated for assignment Sunday following Kansas City's 7-6 victory over the Texas Rangers in 10 innings. To replace him, the Royals selected the contract of infielder Tony Abreu from Triple-A Omaha.
Betancourt, 30, signed a $2 million, one-year contract in December, rejoining the Royals after playing for them from 2009-10. He snapped an 0-for-20 skid with a double on Friday, then started at third base Sunday and went 0 for 4 to drop his average to .228.
The 27-year-old Abreu was hitting .322 with nine home runs, 36 doubles, five triples and 73 RBIs in 103 games with Omaha. He has a .251 batting average in 146 major league games with the Los Angeles Dodgers and Arizona Diamondbacks.