Celtic have signed Kiko Mizuno so i decided to edit him so he is due to join the club in january except when i type his name he is not there and when i type his team JEF utd their squad is empty ...whats going on?

could be wrong but i dont think si have the license for japanese leagues, so that would be why...

I think rinso is right.

so can't you actually manage in them?

Since you edited him, so he should be in the game. Maybe his reputation is too low and therefore, you cannot find him in the game. Try editing him again and change his reputation.