Development hooker Duncan Casey and academy players Greg O'Shea and Niall Horan started for Shannon as they were beaten 20-17 by Garryowen in the semi-final of the ODM Financial Munster Senior Cup.
The academy's Sean McCarthy also featured off the bench as he continues his recovery from a knee injury.
Academy winger Alex Wootton started for Garryowen who will now face Cork Con in the final after Con beat UCC at the Mardyke in the other semi-final.
Munster academy's Johnny Holland starred for Cork Con contributing 16 points in a 21-11 win for the Temple Hill side.
Another academy player, scrum-half Brian Haugh played as Young Munster saw off Highfield 27-18 to progress to the final of the ODM Cyril Fitzgerald Plate.