PHILADELPHIA -- Aaron Cook threw a bullpen session Saturday afternoon at Citizens Bank Park. Manager Bobby Valentine said the team has established a plan for Cook to get on a rehab assignment, but only once Cook's legs are ready. Cook needed stitches in his left knee after his only big league appearance of 2012 on May 5.
"Cook threw a bullpen [session] today, and we do have a plan," Valentine said. "He's running, he ran [Friday], he's running today, when he gets his legs underneath him, I think we're going to try to get him on a rehab assignment."
The stitches made it hard for Cook to keep his legs in shape.
"I couldn't do much running with the stitches in the knee," he said. "We've been doing the [simulation] games. I've been able to ride the bike. I feel like things are progressing the way they need to.
"I feel great. No issues, no setbacks from here on out ... I'd love to tell you one start, two starts, but until I go out there and do it, I really don't know."
Another potential member of Boston's rotation, Daisuke Matsuzaka, remains scheduled to start Tuesday for Triple-A Pawtucket, but Valentine made that seem less than a guarantee.
"It seems like he's a go, but I don't know," Valentine said. "Those 95 pitches [he threw Thursday] may be a little more than he's ready for, but we'll see. I think his elbow feels great."
Valentine indicated the left side of Matsuzaka's neck may still be an issue, and said the righty received an injection for it in Spring Training. Matsuzaka cannot make a Minor League start after May 22 because of the 30-day limit on rehab assignment for pitchers unless a physical condition necessitates it.
"You know that thing up here, that he kind of gets injected, I think it's a chronic thing," Valentine said. "I think he's had it for [awhile]."