Paddy Lane has been added to the Northern Ireland squad for their upcoming Euro 2024 qualifiers.
He replaces Pompey team-mate Gavin Whyte in the squad, with the forward having been substituted with an injury during Saturday's home victory over Peterborough.
Michael O'Neill's side visit Slovenia on Thursday (7.45pm kick-off) and then Kazakhstan on Sunday (2pm kick-off).
They currently sit fifth in Group H after collecting three points from their opening four matches.
Joe Morrell is also on senior international duty with Wales, while Terry Devlin is part of the Northern Ireland under-21 squad.