OAKLAND -- Closer Andrew Bailey is progressing well in his recovery from a rib cage muscle strain and could return to the A's by week's end.

Bailey, who hasn't pitched in a game since July 20, threw a bullpen session Sunday and reported no setbacks. He played catch Monday and will throw a simulated game or bullpen session on Tuesday.

"We're still a couple days away, but it's getting close," Bailey said. "Each and every day you're feeling better and now that I'm feeling good, it's just about getting back into baseball and game form."

Bailey said he still doesn't know whether he will need a Minor League rehab assignment, saying the team will assess the situation on Tuesday.

"That's up to them," Bailey said. "I haven't talked to them too much about it. ... Hopefully by the weekend I will be good to go."

Rosales could miss 4-6 weeks

OAKLAND -- Wearing a blue polo shirt and propped up on a pair of crutches, Adam Rosales rejoined his teammates in Oakland on Monday.

The valuable utility player has been out since Wednesday due to a stress fracture in his right ankle. It marked the 22nd time Oakland used its disabled list this season, three shy of the record 25 DL trips it endured in 2008.

"It's nagging, which is probably the most frustrating thing," Rosales said. "It's so small, but it affects so much of the game. Your feet are everything in the game."

Rosales said he first started experiencing discomfort in his ankle last season with Cincinnati and that he also felt it while playing winter ball in Mexico. But it wasn't until after this year's All-Star break that the pain became intolerable.

"I'm not sure if the rest helped it or hurt it -- just keep on going without taking four days off," Rosales said.

Rosales said he can't do anything but rest for the time being, and he will likely go home to visit his family at some point. There's a chance he could return by the end of the season, which has seven weeks remaining.

"Doctors are saying different things," Rosales said. "They're saying four to six [weeks], but I want to be optimistic and say only two to three."