Alaniz cleared waivers and was outrighted to Triple-A Louisville on Saturday, Charlie Goldsmith of The Cincinnati Enquirer reports.
Alaniz was designated for assignment by the Reds on Wednesday.
Alaniz was recalled by the Reds to serve as the 29th man in Wednesday's doubleheader against the Cardinals.
Alaniz (calf) was activated from the 10-day injured list and optioned to Triple-A Louisville, source reports.
Alaniz (calf) reported to Triple-A Louisville to begin a rehab assignment Friday, Bobby Nightengale of The Cincinnati Enquirer reports.
Alaniz was placed on the 10-day injured list with a left calf strain Saturday.
Alaniz was removed from Friday's game against the Cardinals in the top of the seventh inning with an apparent injury, Charlie Goldsmith of The Cincinnati Enquirer reports.
Alaniz's contract was selected by Cincinnati on Monday.
Alaniz signed a minor-league contract with the Reds on Friday as a non-roster invitee.
Alaniz was non-tendered by the Reds on Wednesday.