Geren said Chavez had returned home and would undergo testing soon. In the meantime, the team recalled infielder Gregorio Petit from Triple-A Sacramento.
"He's playing decent," Geren said of Petit, 24, who was hitting .239 with a home run and three RBIs in 19 games with Sacramento. He had played 14 games at shortstop and five games at second base. Petit, a native of Venezuela, made his Major League debut with Oakland last year and hit .348 in 14 games over three stints.
"He's a guy that can play a lot of different positions," Geren said. "He's familiar with the team and the organization and he played every position in Spring Training."
For Petit, it's another chance to impress the big league club. He said all Geren told him when he arrived at the ballpark was, "Be ready."
"As a ballplayer, I feel sad about one of my teammates getting hurt," Petit added. "Unfortunately, we can't control that. But I'm trying to enjoy this time as much as I can while I'm here. It's another opportunity to see guys working every day to give 100 percent. I'll see where I want to be."
For Chavez, it's another frustrating setback among a long list of recent injuries.
This marks Chavez's sixth stint on the DL in his career and the fourth time in the last three years. He had four surgeries in less than a year between September 2007 and August 2008, including his most recent surgery to repair the labrum in his right shoulder. Chavez started each of Oakland's first four regular-season games at third base, but only four of the past 15. He was limited to 23 games with the A's last year and has appeared in 121 games from 2007-09.
And now Chavez is on the DL along with infielders Mark Ellis (strained right calf) and Nomar Garciaparra (strained left calf), forcing the A's to start Bobby Crosby at third base and recent Triple-A callup Eric Patterson at second.
"I like what he can do on the bases," Geren said of Patterson. "He deserves a chance to show us what he can do. He can really ignite an inning quickly. He can get on base any which way, he can run, he can go first to third, get on base and score."
But at the beginning of 2009, Geren didn't count on relying on Patterson and Petit to fill out his roster, so the all too redundant and annoying waiting game on the road to better health continues for the A's.
"Those players on the DL are all excellent Major League players," Geren said. "We need them to get healthy, but in the meantime, [their replacements] need to get after it really hard in practice and in the game."