The Twins acquired Bannon from the Mets on Tuesday.
Bannon signed a minor-league contract with the Mets on Monday that includes an invitation to spring training.
Bannon cleared waivers and was outrighted to Triple-A Sugar Land on Tuesday.
Bannon was designated for assignment by the Astros on Sunday, Julia Morales of AT&T SportsNet Southwest reports.
Bannon (finger) is slashing .256/.375/.385 across 11 games since being reinstated from Triple-A Sugar Land's 7-day injured list June 20.
The Astros announced Sunday that Bannon has been shut down at Triple-A Sugar Land due to right index finger fracture, Danielle Lerner of the Houston Chronicle reports.
Bannon was optioned to Triple-A Sugar Land by the Astros on Monday.
Bannon is starting at designated hitter and batting eighth Friday versus the Phillies.
Bannon was recalled from Triple-A Sugar Land on Tuesday, Brian McTaggart of MLB.com reports.
Bannon was optioned to Triple-A Sugar Land by the Astros on Tuesday, Brian McTaggart of MLB.com reports.