Riefenhauser was released by the Astros on Saturday, Jake Kaplan of the Houston Chronicle reports.
Riefenhauser signed a minor league deal with the Astros on Tuesday, which includes an invite to spring training, The Houston Chronicle's Jake Kaplan reports.
Riefenhauser cleared waivers and was outrighted off the 40-man roster Thursday, Carrie Muskat of MLB.com reports.
Riefenhauser was optioned to Triple-A Iowa on Friday.
The Cubs released Rex Brothers on Thursday, helping Riefenhauser's long-shot chances of making the Cubs out of camp.
Riefenhauser was claimed off waivers by the Cubs on Friday.
Riefenhauser was designated for assignment Thursday.
Riefenhauser was traded to the Orioles on Wednesday along with Mark Trumbo in exchange for Steve Clevenger.
Riefenhauser was traded to the Mariners on Thursday, Bob Dutton of the Tacoma News Tribune reports.
Riefenhauser will be called up when rosters expand Tuesday, Marc Topkin of the Tampa Bay Times reports.