Maybe to strengthen elsewhere?
It is just a thought, but with resources being tight it is the manager's job to allocate the available resources to maximum effect - is having 2 first team keepers sensible when other parts of the team need addressing?
(don't get me wrong - it would be GREAT to have two first team players available for every position, as we do for the gk postion, as Chelsea did when Mourinho built his first squad! Can you imagine that?! )