He also said the team is still in discussions on surgery options.
Hayward was only a few minutes into his Celtics career when he landed awkwardly on the floor, causing his ankle to end up in a disfigured form enough to elicit pained reactions from spectators and fellow players alike.
According to Hayward's agent Mark Bartelstein, it's unrealistic to expect the star forward to be on the court again this season.
Hayward made a surprise appearance before last night's home opener against the Milwaukee Bucks via the Jumbotron and from his hospital bed.
"I think so", he said. "But I'll be supporting you guys from here, and wishing you the best of luck". I just tried to give him words of encouragement.More news: 'Much tougher game' - Mark Lawrenson predicts Tottenham v Liverpool
"I think that we will probably look at the roster spot", Stevens said.
"We'll see how that works itself out". "We're just keeping Gordon in our prayers, hoping everything is all right".
Celtics forward Daniel Theis wrote "GH20" on his shoe, and a fair number of Hayward's No. 20 jerseys were visible in the crowd.
Stevens noted how his players' thoughts are on Hayward. "This is a setback, but there's going to be a full recovery".