Mantha, who scored 50 goals for Val D'Or last season, played in one preseason game for Detroit.
The Red Wings also sent forward Andres Athanasiou and defenseman Mark McNulty back to their junior teams. Athanasiou was returned to Barrie of the Ontario Hockey League; McNulty returned to Prince George of the Western Hockey League.
Detroit also released forward Barclay Goodrow from his tryout contract.
The Red Wings have 55 players remaining in camp.