The 7-day DL is specifically for concussions. The Red Sox told the media that Ross suffered the injury on Saturday against the Toronto Blue Jays, but did not provide specific details. Ross took multiple foul balls off his facemask during the game, which seems the likely cause of injury.
Ross has served as the backup catcher to Jarrod Saltalamacchia this season. The catcher has struggled to make contact at the plate, but managed to draw walks and hit for power. Ross is hitting .209/.320/.512 in his first 50 plate appearances this season.
Lavarnway is receiving his second promotion to the Red Sox this season. The catcher stayed with the team three days in April, but did not make an appearance. The 25 year-old has been challenged offensively the past two seasons at the big league level, hitting .172/.230/.286 through his first 209 plate appearances.
The catcher has hit well this season for Triple-A Pawtucket, and hopes to carry over some of that success. Lavarnway hit .305/.400/.463 in 100 plate appearances this year, including two home runs and 15 RBIs.