The ban starts straight away, meaning Sheridan will have to watch Tuesday's FA Cup second-round replay with Peterborough from the stands.
The Magpies boss had admitted that his job was under threat after six successive League defeats.
The ban starts straight away, meaning Sheridan will have to watch Tuesday's FA Cup second-round replay with Peterborough from the stands.
The Magpies boss had admitted that his job was under threat after six successive League defeats.