Old Crescent are upset that centre Mike Mullins and scrum-half Eoin Reddan have been called up for the National Trial at Lansdowne Road on Friday.
The Limerick club have to face Dolphin in the Division Two final 24 hours later, and are upset that the Ballymena players were excused from the Trial to take part in the Division One final.
Meanwhile, Crescent's Division Two opponents Dolphin will be without Mike Pettman (dislocated shoulder), Mick Manning (exam-tied) and Lenny Twomey (hamstring).
Donnagh Keeshan, Jack Purcell and Mike Knowles will deputise.