The Red Sox did not offer an official update on Tim Wakefield’s condition but the Globe has learned from multiple sources that the knuckleballer has a stress fracture of the rib cage.
Wakefield, who was not available for comment, is expected to miss from three weeks to a month and is expected to go on the disabled list retroactive until Tuesday.
Lefthander Kason Gabbard, a 29th-round draft pick in 2000 who was 9-2 with Double-A Portland, is expected to be called up to replace Wakefield and start Saturday vs. Seattle.
The Red Sox are now going to take Wells with them to the West Coast. Boomer will pitch a side session Friday in Seattle and will pitch another simulated game Monday in Oakland.