BOSTON -- Red Sox manager John Farrell said Sunday that third baseman Will Middlebrooks will begin his rehab assignment with Triple-A Pawtucket on Monday.

Farrell said that the tentative schedule for Middlebrooks will be to play Monday, Wednesday and Thursday before being reevaluated in terms of a roster decision.

Middlebrooks was placed on the disabled list April 6 with a Grade 1 calf strain he sustained while warming up for an April 5 game against the Milwaukee Brewers. Middlebrooks went 3-for-13 with a home run and an RBI in four games before his injury.

Outfielder Shane Victorino will join Middlebrooks in Pawtucket on Monday as he continues his rehab from a spring training hamstring injury.

Victorino, who played six innings in right field with the PawSox Saturday before being lifted for a pinch hitter, went 0-for-3 during his first rehab game. He’ll be expected to get four at-bats Monday and play nine innings Tuesday before being reevaluated.

Farrell said that Victorino could be activated Wednesday, prompting the need for the team to make a move regarding one of their outfielders.

“We’ve looked at every available combination of outfielders that are here with us and ultimately there will be a roster decision to be made,” Farrell said. “We’ll get to that in the coming week.”

In Victorino’s absence, the Red Sox have used nine different outfield combinations.