"It will be at least three months and it could be much longer than that," Bruce told the BBC. "He's poorly at the moment, I went to see him in hospital.
"We're obviously disappointed with the injury. He's still in hospital and things aren't great. We hope that he has a speedy recovery, of course, as losing him is a blow to us."
Grealish has made 79 appearances for Villa's senior side since 2013 and played in 31 league matches last season.
(Reporting by Aditi Prakash in Bengaluru)
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