"No clue," Crosby said before the opener of a three-game series against the Rangers at Ameriquest Field. "It's frustrating, to say the least."
"He's [out] indefinitely," added manager Ken Macha. "When he first got hurt, we gave him two days off, and that didn't help. Then we shot him up, and that didn't work. So we put him on the DL and gave him 15 days. Well, obviously that didn't work, either.
"Now he gets another 15 days. Is that going to do the trick? Nobody knows."
When Crosby does return, it's likely he won't jump right back into an everyday role. He'll still be the starting shortstop, but athletic trainer Larry Davis suggested that his workload would be limited to prevent another setback.
"When you bring a guy back without a rehab stint [in the Minors], you have to do your rehab on the active roster," Davis explained. "You play a day, take a day off, play a day, take a day off -- just like you do in a rehab stint."
Macha said Crosby was going to undergo more testing in the injured area when the team gets back to Oakland, but Davis said that hasn't been decided. That will be up to team physician Dr. Allen Pont and team orthopedist Dr. Jerrald Goldman.
"It's something we're considering," Davis said of the additional test. "We'll see what the doctors say."
Infielder D'Angelo Jimenez was recalled from Triple-A Sacramento for the second time this year to replace Crosby on the 25-man roster. Jimenez was called up when Crosby went on the DL for the first time and went 0-for-2 in extremely limited playing time.
Kudos for the catcher: Jason Kendall was Oakland's hottest hitter down the stretch last season, batting .324 in September and October to end a personally disappointing season on a positive note.
Kendall got off to another slow start in his second year with the A's, but he's once again heating up as the games grow in importance.
The veteran catcher batted .462 (12-for-26) in the first seven games of the road trip, and entering the Rangers' series with the A's, he was batting .431 (22-for-51) with nine multiple-hit games over his past 12 starts to lift his average to .291 -- the highest it's been since he joined the A's as a career .306 hitter over nine seasons in Pittsburgh.
"It's good to see," said outfielder Mark Kotsay, Kendall's closest friend on the team. "He's our leadoff guy, and it seems like he's always on base. He's spraying the ball around the field and driving it into the gaps, like the hitter we all knew he was when he got here."
Dribblers: Closer Huston Street, on the DL with a groin strain, will rejoin the team Saturday to continue treatment. He's been in the Bay Area working with a therapist since Monday. ... Righty Rich Harden, whose throwing program was previously limited to long-toss sessions, played a short, more intense game of catch Friday. He'll throw long again Saturday, go the short-and-intense route Sunday, and if all goes well, he might throw off a bullpen mound late next week. ... Macha said he still hasn't decided who will start Tuesday against the Red Sox, lefty Brad Halsey or righty Kirk Saarloos. ... Esteban Loaiza, a former Ranger who owns a home in nearby South Lake, hosted teammates and coaches on Thursday. The party was catered and, according to Macha, "very nice." ... Steve Karsay, who announced his retirement June 18, was a guest in the A's clubhouse before the game.
Coming up: A's righty Joe Blanton (13-10, 4.47 ERA) will take on Rangers righty Adam Eaton (3-3, 4.45 ERA) in the middle game of the series Saturday. The first pitch is set for 5:05 p.m. PT.