From the rotation to each side of the bullpen, the Phillies pitching staff is in flux right now. Phillies general manager Ruben Amaro Jr. plopped onto the bench in the home dugout before Friday’s game and gave some insight on what the Phillies options are.

Starters

With Roy Halladay out indefinitely, the Phillies signed Carlos Zambrano this week to a minor-league contract. The volatile former top-tier pitcher reported to Clearwater, Fla., to begin extended spring training.

Amaro said Zambrano will pitch two innings Saturday, and pitch every five days from there.

“He’ll throw no more than 30 or 40 pitches tomorrow, then probably no more than 50 the following time, then see how he progresses,” Amaro said.

Meanwhile, John Lannan — the other injured Phillies starter — will throw a bullpen either Monday or Tuesday, and Amaro said the lefty is “closer, but he’s not close” to returning.

Bullpen

B.J. Rosenberg was in the clubhouse Friday, as he was called up from Triple-A Lehigh Valley earlier in the day. He’ll replace Raul Valdes, who was sent to Lehigh Valley.

Valdes struggled in his time with the Phillies this year, posting a 7.65 ERA in 10 appearances.

“We’re going to see if [Rosenberg's] better than Valdes. It’s pretty simple,” Amaro said. “Our middle relievers have not been very good, so we’re going to see if Rosey can come in [and perform].”

Rosenberg, who said he was “shocked” by the call-up, has been mostly a starter this season. He has a 1-3 record with a 4.30 ERA this season and has given up 18 earned runs in his last 37 2/3 innings pitched.