Northern Ireland's preparation for a demanding schedule of four Nations League matches in early October is complicated by recent player movements and fitness issues.
The squad has undergone significant changes during the summer transfer window, with several players securing permanent deals or loan spells abroad.
Kieran Morrison, currently based at Sheffield Wednesday on loan, joined the group in June alongside Ceadach O'Neill and Braiden Graham from Everton.
Both Morrison and the O'Neills made their international debut during a friendly match against Guinea earlier this summer.
Justin Devenny has already begun his tenure at Stoke City with immediate impact, scoring twice in his first appearance since joining from Crystal Palace.
His transition to central midfield at the Potters could potentially address the gap left by McCann following the World Cup play-off loss to Italy in March.
Isaac Price is expected to occupy an advanced midfield position, which may influence decisions regarding the deployment of Galbraith elsewhere in the formation.
Ethan Galbraith, a former Swansea City player, offers versatility and could be utilized deeper in midfield to increase his involvement in build-up play.
Brodie Spencer from Oxford United represents another option for the left-back role if Bradley is not required on the right flank.
Patrick Kelly and Callum Marshall remain available as alternatives, though the selection committee must weigh their experience against unproven attacking talent.
Jamie Donley has established himself as a centre-forward in recent form, netting goals against Luxembourg and Wales while deployed as a striker.
Reports suggest he is unlikely to be shifted into a deeper position given his current effectiveness up front.
Michael O'Neill received positive feedback from Arsenal manager Mikel Arteta during pre-season training sessions before making an off-the-bench appearance against France.
The final squad will be announced on Tuesday, with the coaching staff balancing tactical needs against individual form and availability.
Injuries sustained over the summer have added another layer of complexity to the selection process for the upcoming campaign.