Antwi has been frozen out of the team after going AWOL, just five months after joining the side.
Antwi, who joined the Tarkwa-based from Asante Kotoko, went missing this week.
The 2016 CAF Confederation Cup campaigners have indefinitely suspended the former Amidaus Professionals shot-stopper for unprofessional conduct.
GHANAsoccernet.com understands the conduct of the former Kotoko glovesman has shocked officials of the Mauve and Yellows.
Anwti, an ex-Ghana Under-20 goalkeeper, joined Medeama to revive his career after struggling at local giants Kotoko.
He emerged the side's number first-choice at the start of the season until he was knocked back by a shoulder injury.
But second-choice goalkeeper Yaw Ansah Fufuro has stepped up in his absence, excelling heavily in the last four games.