The Chicago Cubs, losers of five straight games, might be down two key pitchers heading into their three-game series starting Friday against the Cincinnati Reds.

The Cubs put reliever Kerry Wood on the 15-day disabled list with right shoulder fatigue.

Ryan Dempster had an MRI on his right quad Friday and his start against the Reds on Sunday is questionable, a source familiar with the situation told ESPN Chicago's Bruce Levine.