However, that could change, depending on the status of left-hander David Wells, who threw 64 pitches in a simulated game on Friday. Francona said that Wells, who has been sidelined since April 26 with a sprained right foot, responded fine to Friday's activities and will likely throw a side session on Monday.
There's still a chance Wells could take the ball on Wednesday, instead of Gonzalez, but Francona wasn't ready to make a definitive decision.
"We can wait as long as we want," Francona said. "We just want to make sure he's healthy. We're lined up for Jeremi. If and when we make a move, we'll talk to David, we'll talk to the trainers and then we'll announce it. But there's no sense announcing stuff beforehand, it just doesn't make sense."
Timlin broadens horizons: Red Sox right-hander Mike Timlin might be 39 years old, but he pitches like a man who could be 10 years younger. Aside from Timlin's durability and leadership, another impressive trait is that he's still expanding his repertoire.
"He's throwing four pitches now," Francona said. "He threw a changeup last night, 0-1, to the leadoff hitter in the inning. That was an unbelievable pitch. He's got a curveball. He's got a better mix of pitches than he used to. His velocity is not down. He's older, but he's maintained his velocity. He's good. I think he's armed to stay good."
Olerud update: First baseman John Olerud played in his first extended Spring Training game on Saturday and went 3-for-4. Because he's been nursing a tweaked hamstring, Olerud was instructed not to run at full speed. Instead, he ran nine 40-yard sprints.
Francona said the club has no specific timetable on when Olerud will be activated, or, for that matter, depart Fort Myers, Fla.
"When he leaves Florida, we want to make sure he's ready to play and not limping, and not beat up," Francona said. "They're keeping a pretty close eye on him."
On deck: The Sox send Bronson Arroyo (4-0, 2.91 ERA) to the mound Monday night for the start of a three-game series in Oakland. He'll be opposed by Kirk Saarloos (1-2, 5.09 ERA). The Sox swept the A's in a three-game series at Fenway Park last week.
Ian Browne is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.