How should sports players be disciplined?

Convicted felons should be allowed to return to prior positions as professional sports players.  They need a job, and probably worked much of their life in pursuit of their sports career.  If players slap, spit on or abuse the coach then they should be fined.  If they continue to misbehave they should loose their playing position and sit on the bench.  Paying no heed to any of these should then result in losing their job as a sports player.