Shanahan sustained a leg injury last month which has caused him to miss a number of training sessions. A decision on Shanahan, who despite the injury, scored the winning goal last time out over De La Salle, will not be made until moments before the throw-in.
Tomorrow’s victors will be in quarter-final action six days later against Tallow with holders Mount Sion, Ballygunner, and emerging Ballyduff Lower all safely through to the semi-finals.
Lismore will be marginal favourites, but their hopes of progression will depend largely on the fitness of Shanahan.
Lismore will also rely heavily on Dave Bennett at midfield along with James O'Connor, the O'Sullivans, William Cunningham, Eoin Bennett, and Paul Prendergast.
Roanmore will bid to overcome the disappointment of losing to Mount Sion last time out.
Ger Quinlan, the Murphys, Philly Flynn, and Laurence O'Neill will spearhead their challenge.
The curtain raiser will be the SFC meeting of Ardmore and Kilmacthomas at 2pm with the Prendergasts and the Hennessys expected to lead the seasiders to victory.
Intermediate champions John Mitchels face Clashmore at 6.30pm in the same venue tomorrow with the latter favourites to progress while Rathgormack should overcome Ballinacourty in this evening’s game at Fraher Field, (6.45pm).