If he wants to continue playing football on a regular basis, he won't be doing it here so a move is inevitable.
I have no doubt that when he's finished playing he'll be back and doing his coaching badges. We've got a big shiny training facility and a host of youngsters just waiting for the...
http://www.hitc.com/en-gb/2016/05/17/por-clubs-eye-calderon-after-brighton-exit/
If it's true that he's on the way out - and it's not particularly surprising - he will always be welcome here.