BOSTON -- Catcher David Ross was placed on the seven-day concussion disabled list before Sunday's 12-4 loss to the Blue Jays. Ryan Lavarnway was recalled from Triple-A Pawtucket to take his place on the active roster.
Ross sustained the injury during Saturday's 3-2 loss, when he took a pair of foul balls off his mask.
Ross, who was feeling "foggy" later that night, has sustained one other concussion in his career, after being knocked over by Mike Cameron in a home-plate collision in 2007.
"Given his position, we can't put him at risk with any additional foul balls or foul tips to the mask," manager John Farrell said.
Lavarnway has been swinging a hot bat with the PawSox, hitting.321 with seven doubles, two home runs, 15 RBIs, 16 runs and 13 walks.