DETROIT -- The progress reports filed with Yankees manager Joe Girardi all read positive on Saturday, with Alex Rodriguez's looming return the most enticing note of all.

Rodriguez had "a good day" working out at the club's Minor League complex in Tampa, Fla., on Saturday, according to Girardi, and he remains on track to rejoin the Yankees late next week.

The three-time American League MVP is scheduled to have an MRI on Monday in Tampa at 11:30 a.m. ET and will also be able to work out that day. A-Rod could begin a Minor League rehabilitation assignment on Tuesday, playing in an extended Spring Training game.

"So far, so good," Rodriguez told The Associated Press.

According to the AP, Rodriguez took 65 swings in batting practice and fielded 31 grounders at third base during his second injury rehabilitation workout at the Yankees' Minor League complex. Rodriguez was also running in the outfield.

Girardi said that Rodriguez would do the majority of his running in Tampa next week so he can run on a natural grass surface, but he is expected to join the Yankees at Tropicana Field to take additional batting practice when the club plays a four-game series against the Rays, starting on Monday.

The Yankees also had some encouraging news on catcher Jorge Posada, who took batting practice for the second time on Saturday since going on the disabled list on April 28 with right rotator cuff tendinitis.

Posada is expected to begin a light throwing program on Monday to rebuild strength in his shoulder and arm, and he told the AP, "It's coming around good."

Though Posada will rejoin the team on Monday in Tampa Bay for workout purposes, Girardi said he does not expect to see the switch-hitter back in New York's lineup until June 1.

"The throwing program hopefully goes quickly, but I still could see it taking a little bit of time," Girardi said. "[June 1] is in my head. I hope I'm wrong."

Right-hander Jeff Karstens, sidelined since straining his right groin March 27, allowed one run -- on a homer -- and two hits over three innings in his first extended Spring Training start.

Girardi said that Karstens threw 42 pitches and would next bump up to 55 or 60, putting him about four rehab starts away from consideration to join the Yankees.

"Then you take an evaluation of where he's at," Girardi said.

Right-hander Chris Britton rejoined the Yankees on Saturday, and he was added to the 25-man roster as right-hander Jonathan Albaladejo was placed on the 15-day DL with right elbow soreness.

Britton was with the Yankees on Friday, but he left to join Triple-A Scranton/Wilkes-Barre; he got as far as Nashville, Tenn., before turning around and returning to Detroit.