Apr 10, 2010 7:26 AM EST

Mariners pitcher Cliff Lee isn't expected to be activated this month as he deals with a strained abdominal muscle.

Lee threw a 25-pitch bullpen session Friday, but Seattle doesn't expect Lee to be removed from the 15-day disabled list before the end of April.

"Essentially, we're looking at the first week in May," manager Don Wakamatsu said.

Via ESPN