The Mariners released Blandino on Aug. 1.
Blandino was sent from San Francisco to Seattle on Saturday in exchange for Stuart Fairchild.
Blandino signed a minor-league contract with the Giants on Friday, Susan Slusser of the San Francisco Chronicle reports.
The Reds granted Blandino free agency Monday after outrighting him off the 40-man roster last week, C. Trent Rosecrans of The Athletic reports.
Blandino was outrighted to Triple-A Louisville on Thursday.
Blandino (hand) was reinstated from the 60-day injured list and optioned to Triple-A Louisville on Wednesday.
Blandino (hand) is scheduled to begin his minor-league rehab assignment at Triple-A Louisville on Wednesday, Bobby Nightengale of The Cincinnati Enquirer reports.
Blandino (hand) will begin a minor-league rehab assignment next week, C. Trent Rosecrans of The Athletic reports.
Blandino (hand) was transferred to the 60-day injured list Friday.
Blandino won't require surgery to repair his broken right hand, Charlie Goldsmith of The Cincinnati Enquirer reports.