It dosent have any cost to sack him.

Last season i kept 1 MC and he was great. 3 goals in 6 LEAGUE games and 1 goal in 2 CUP games.

This season i am keeping a ST and a MC, free players i like them.

And in my 4th or 5th season, i got a MR who scored a lot of goals, he was great and even got to the 4th star.

If you are low on tokens, they are great to keep as subs.