"He got out to 200 feet beforehand with some strength and power behind it, which is good," Francona said. "He'll do it against on Saturday, and we'll sit down and figure out where to go from there."
After his bullpen session, Matsuzaka reported no ill effects to his right shoulder, which, when it balked on him in Oakland on April 14, sent him to the disabled list the following day. His shoulder is progressing, the extent of which is what his bullpen session showed.
"It's been a while since I've thrown off of the mound, so there were times when my command wasn't quite there," the right-hander said through an interpreter. "But on the other hand, I felt I could put a lot on the ball out there."
As he threw, he said he didn't try to overdo anything. He held himself back from what he wanted to throw.
Like Francona, Matsuzaka tempered his optimism about the session with caution, knowing that just because he felt all right Wednesday, doesn't necessarily mean he'll feel all right Thursday or Friday. Besides, even he knows he's not ready to reclaim his spot in Boston's rotation.
"I don't know exactly when I'll be able to pitch in a Major League ballgame," Matsuzaka said. "But I definitely feel I'm getting closer and closer."
The plan is for Matsuzaka, 28, to throw a bullpen session Saturday in St. Petersburg, where the Red Sox begin a four-game series against the Rays on Thursday night.
From there, if all goes well, he'll go on a rehab assignment. How many rehab starts he'll need is uncertain, Francona said.
But that didn't seem an issue with Matsuzaka, who said he planned to follow whatever plan Francona, pitching coach John Farrell and the training staff cobble together for him.
The pitcher's looking at the long haul, not the short haul. After piling up innings for Team Japan in the World Baseball Classic, Matsuzaka isn't trying to rush back.
"I hope when I look back on this period -- at the end of the season -- I can say I was glad I took that time," he said.