GREEN BAY, Wis. -- The Green Bay Packers will re-sign backup quarterback Joe Callahan, a source told ESPN on Monday.

Callahan was released on Saturday to make room for Aaron Rodgers, who was activated off injured reserve.

The signing did not appear on the NFL transaction list Monday because Callahan had to clear waivers first. That means the Packers do not have to make a corresponding roster move until it becomes official, likely on Tuesday.

According to a source, the Packers will re-sign backup quarterback Joe Callahan, who was released on Saturday to make room for Aaron Rodgers. William Purnell/Icon Sportswire

It could mean the Packers are considering shutting down Rodgers if they're out of playoff contention, which would happen if the Falcons beat Tampa Bay on Monday Night Football. However, the Packers like Callahan as a developmental prospect, so the move could have been in their plans all along after he cleared waivers.

Callahan entered the NFL as an undrafted free agent in 2016 and also has spent time on both the Saints' and Browns' rosters before returning to Green Bay.

Coach Mike McCarthy was noncommittal when asked after Sunday's loss at Carolina whether Rodgers would play Saturday against the Minnesota Vikings if the Packers were out of the playoff race.

Sunday marked Rodgers' first game since he underwent surgery to repair a broken right collarbone two months ago. He threw three touchdown passes but also had his first three-interception game since 2009.

The Packers also worked out two quarterbacks on Monday: veteran Matt McGloin and rookie Garrett Fugate.