Youkilis placed on 15-day disabled list

The Boston Red Sox placed infielder Kevin Youkilis on the 15-day disabled list, retroactive to April 29, with a low back strain.

Youkilis has struggled in the early going, hitting just .219 with two home runs, two doubles and nine RBI in 18 games.

The Sox also recalled infielder Will Middlebrooks and pitcher Clayton Mortensen from Triple-A Pawtucket.

The 23-year-old Middlebrooks is expected to make his major league debut at third base on Wednesday as the Oakland A's come to town.