Bogaerts activated from 7-day concussion list
The moves were announced before Saturday night's game at Tampa Bay.
Bogaerts missed six games after being hit in the head by a pitch from Seattle's Felix Hernandez on Aug. 22.
Ranaudo, who won his third game in as many starts this season by beating the Rays 8-4 on Friday night, can return to the Red Sox after Greenville's season ends Monday.
Red Sox manager John Farrell says ''there's quite a bit of possibility'' that the team will go to a six-man rotation in September due to a combination of workload and the opportunity to evaluate pitchers like Ranaudo.