Napoli had been out with a sprained left finger and hadn't played since May 23. To make room for him on the active roster, Alex Hassan was optioned to Triple-A Pawtucket.
Boston right-hander Clay Buchholz, who is recovering from a left knee problem, threw three simulated innings, and manager John Farrell said he came out of it fine physically. Farrell says it will be important to get Buchholz some game activity.
Farrell also said third baseman Will Middlebrooks, who is out with a broken right index finger, has started hitting.