Technically, He wasn't found "not guilty" of anything, as there was no criminal trial due to "insufficient evidence in law"
As per wikipedia, however,
Of course, he declared himself bankrupt and never paid a penny, but that judgement still stands.
Being a professional footballer isn't a right, but he's certainly entitled to look for work in that field. Equally, individual clubs have the right to choose who they want to employ as long as they don't illegally discriminate.