Galway defender Kieran Molloy is believed to have sustained a cruciate knee ligament injury.
The Corofin man was in action for is club at the weekend when the injury occurred.
Molloy would be a major loss after starring in Galway's run to this year's All-Ireland final.
Inter-county sides are allowed to resume collective training on November 24.
READ NEXT:
Five in hospital after 100 hooded German fans 'in disguise' storm Wembley pub
Rare Michael Schumacher health update offered by close pal who visits F1 legend three times a week
Stuart Lancaster summer move to Racing 92 confirmed by Leinster Rugby
GAA has reached "crisis point" over referee assaults says Wexford chief
Threat of further IABA funding cuts on pause as Sport Ireland talks progress well
Get the latest sports headlines straight to your inbox by signing up for free email alerts
