I want to fire Lorenzo Coenen to make a free spot in my team but the board don’t let me.
They tell me my squad (fastticker) already is too small. I have 40 player from which 5 are loaned out. Bug?

Another player is not a problem. Probably it’s only a wrong message because I hired Coenen T1 of the current season.

The message is not wrong, just unclear I guess. You have one GK transfer listed and the other one loan listed, that’s why you see the “small squad” message, the board does not count loan listed and transfer listed players so it considers him to be the only GK your squad is keeping at the moment.