Prospect Roster.

To get a player onto your Prospect Roster he must be under 25 and played less than 25 games in the NHL. Can a Prospect be left on that roster if he gets called up and plays more than 25 games or must the player be taken off the Prospect Roster once the age of 26 is reached or 25 games are played?

Presumably if the call up to the main roster is required in most cases someone would then have to be placed on waivers to open up a spot for the graduated prospect. Ideally once on the Prospect Roster they should be able to remain until the manager has a spot or a trade is initiated.

A clarification on this would be helpful