The Chicago Cubs have placed starting pitcher Ryan Dempster on the 15-day disabled list after he strained his right quad during a bullpen session earlier this week.

Dempster, the Cubs opening day starter the last two seasons, has made at least 31 starts, and pitched at least 200 innings over the past four seasons. He is tied with the Phillies’ Cole Hamels and Dodgers’ Aaron Harang for the National League lead in strikeouts with 23.

Dempster posted a fWAR of 5.2 in the 2008 season when he won 17 games for the Cubs with a 3.41 FIP.

2009: 3.7 fWAR
2010: 3.4 fWAR
2011: 2.8 fWAR

Taking his spot in the rotation will be Randy Wells, a 12-game winner for the Cubs in 2009. Wells has started three games for Triple-A Iowa, posting a 9.42 ERA. Wells failed to make the team out of spring training, despite 7 1/3 scoreless innings in three appearances, and his $2.7 million salary. He posted a 3.2 fWAR in the 2010 season.