Bruce Chen has allowed 16 earned runs over four starts and 19 1/3 innings for the Royals.
Bruce Chen has allowed 16 earned runs over four starts and 19 1/3 innings for the Royals.
Mark Duncan/AP

KANSAS CITY, Mo. -- The Royals placed left-hander Bruce Chen on the disabled list Friday with a bulging disk in his back and recalled right-hander Aaron Brooks from Triple-A Omaha.

Chen was supposed to start Saturday against Detroit, but he struggled with the pain in a side session on Thursday, even after receiving an epidural that was supposed to alleviate it.

Afterward, Royals manager Ned Yost acknowledged that a DL stint was likely.

Left-hander Danny Duffy will slide from the bullpen into Chen's spot in the rotation.

Brooks, who was 0-1 with a 4.80 ERA at Omaha, provides some bullpen depth. He spent five days with the Royals in early April but did not appear in a game.

Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

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