The Rays 26 man roster will always be in flux, but a number of players have already been assigned to minor league camp, among them some players who already have big league experience and others who are awaiting a call up.
Over the years, the key players for the Rays have often been those who did not break camp with the big league team. Sometimes top prospects are maybe left in the minors with an eye to avoiding Super Two contract status (Evan Longoria in 2008, Wil Myers in 2013, Wander Franco in 2021).
In other situations an unexpected player may be called up out of necessity and he ends up playing a key role.