NEW YORK - The captain is ready to test his twice broken ankle.

Derek Jeter will start a rehabilitation assignment today with Triple-A Scranton/Wilkes-Barre, the first step toward returning to the Yankees. He is scheduled to play at least five innings at shortstop.

Whether he will be able to don his pinstripes before the All-Star break is to be determined.

"I think he has to feel comfortable playing," manager Joe Girardi said Friday. "He really hasn't had a whole lot of at-bats. He has not played a whole lot of infield. So (we need to see him) being able to go back-to-back days, back-to-back-to-back days, that sort of thing."

Jeter joins third baseman Alex Rodriguez in the minor leagues. Jeter is starting with the Yankees' top minor-league club because he appears to be further along than A-Rod, who has played two games for Class A Charleston and is is hitless in his first four at-bats.

Rodriguez's game Friday with the Tampa Yankees, a high-A club, was postponed by rain. He has said he thinks he will need the full 20 days allowed for a rehab assignment to prepare to play after having left hip surgery in January.

Yankees general manager Brian Cashman would not commit to seeing either player back before July 15.

"Those guys will be ready when they're ready," Cashman said. "That's it."

Jeter broke his ankle in the opener of the AL Championship Series on Oct. 13 and had surgery soon after. A new break was discovered April 18.

Reds, Giants getting creative with makeup

CINCINNATI - The Reds and Giants were exploring numerous options Friday for making up their rained-out game in Cincinnati, including the possibility of playing it in San Francisco, or Denver.

Day-long rain forced the teams to call off the final game of their series scheduled for Thursday afternoon. It was San Francisco's only trip into town.

The teams share an off day on Aug. 29, their only break in long stretches of games. Both teams would like to keep that day free.

Reds manager Dusty Baker said Friday the teams are exploring three or four scenarios, including playing the makeup in Colorado or as part of a doubleheader in San Francisco.

Inside pitch

• Rays right-hander Alex Cobb threw off a mound Friday for the first time since being hit in the head by a line drive last month.

"The bullpen went great," Cobb said, although there is no timetable for his return.

• Royals outfielder Alex Gordon passed a battery of concussion tests and was cleared by the team's medical staff to take batting practice Friday, but not to play in a game yet.