Armagh defender Aaron Kernan could miss the Ulster SFC quarter-final against Cavan on 8 June at the Athletic Grounds after suffering a torn hamstring.
The Crossmaglen player sustained the injury on Sunday, in his second club game following an injury lay-off.
Kernan missed Crossmaglen's Ulster club campaign and the Football League with Armagh as he took an extended break to avoid serious Achilles damage.
The half-back's absence would be a major blow for the Orchard county.
Armagh manager Paul Grimley has brought five new players into the squad for June's meeting with Cavan.
Silverbridge's Seamus Kelly, John McGill from Carrickcruppen and Grange player Míceál McKenna come in.
The trio are joined by goalkeepers David O'Hagan (Grange) and Tim Harney (Pearse Og).