"I just knew I couldn't run," Giambi told Troy Renck of the Denver Post. "But I did get it before it pulled really badly. I will know more in the morning."
Giambi said he hurt the quad in a game against the Brewers on July 17. He said he hopes he doesn't have to go on the disabled list.
Renck said Giambi isn't particularly looking to leave the Rockies, but would go to a contender and would hope to re-sign with the Rockies in the offseason.
Giambi is hitting .260/.357/.625 with 10 home runs and 24 RBI in 112 plate appearances.For more baseball news, rumors and analysis, follow @cbssportsmlb on Twitter or subscribe to the RSS feed.