The CFL also effectively barred Manziel from joining any other team in the league.
The former National Football League quarterback would have been sent to the San Antonio Commanders since he played at Texas A&M, but the team released his rights.
Johnny Manziel's football career hit quite the road block when he was barred from the Canadian Football League at the end of February, leading to his release by the Montreal Alouettes.
Manziel had previously said on Barstool Sports' Comeback SZN podcast that he was intrigued by the prospect of playing in either the AAF or the XFL, which begins operation next year.
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He's 42-46 as a starter with a 62.8-percent completion rate, 20,434 passing yards, 123 touchdowns and 75 interceptions. Their attempt to get Teddy Bridgewater failed, which leaves them with only Luke Falk and Jake Rudock at quarterback.
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The eight-team AAF is midway through its inaugural season this spring. Due to a mechanism within the league's rules, Manziel headed straight to the waiver wire.
The Express have struggled to find a successful quarterback so far this year, which could provide Manziel a quick opportunity to take the field. He's their second quarterback this season, after the team started with Christian Hackenberg but later benched the former Penn State quarterback. The Express lost quarterback Zach Mettenberger on Saturday, who left after their first offensive snap with an ankle injury - according to the Memphis Commercial Appeal. In his first game for Montreal, he threw four interceptions on 11-of-20 passing for 104 yards.
"We are pleased to welcome Johnny Manziel to the Alliance of American Football, which we've always described as a league of opportunity for talented players to launch or revitalize their pro football careers", Polian said in a press release.
The 26-year-old former Heisman Trophy victor last played for the Montreal Alouettes in 2018, where he threw for almost 1,300 yards, five touchdowns and seven interceptions in eight games.