i believe you mean ffX but you have to replace him, it doesnt have to be him tho, just go up to ppl and push square and if they are a blitzball player it will give you a chance to hire them for gil, if you want letty tho,(he is a besai auroch right, its been awhile since ive played) then go to luca then the auroch's locker room and you can rehire him there
Pick up some new players. I believe if you press square to talk to them, you can sign them if they play. I recommend you pick up Wedge. Once he gets to level 50 he's crazy 1337. I think he's near the locker room somewhere. I don't remember.
if we are recommending ppl, then ill recommend brother(he helps fly the airship) and nimrook(also on the airship w/ other blitzball players), also you can rehire your players on the same screen where it says their contract expired, not to be a smart ass, but didnt you notice that?