Claimed off waivers from the Rockies earlier this month, Garneau has quickly impressed within the A's organization, hence the club hasn't rushed Josh Phegley's return from the disabled list.
Phegley, who is rehabbing a left oblique strain with Triple-A Nashville, is scheduled to rejoin the A's when rosters expand Friday, giving the A's three catchers. To this point, though, Garneau has put himself in position to be among the two on next year's roster.
Along with homering Monday night, he nailed Ben Revere at second base on a stolen-base attempt and helped starter Daniel Gossett battle through an impressive start, all while playing in front of roughly 50 friends and family members.