Sheffield United have released a statement declaring that they are "appalled" by the abuse directed at those who have challenged the club's decision to allow convicted rapist Ched Evans to resume training.

The League One outfit has vowed to impose lifetime bans on anyone who sends online threats in relation to the issue, and will work with South Yorkshire police to identify those responsible.

"Sheffield United Football Club is appalled at the recent condemnation and abuse that has been levelled at both some of its more high profile supporters and those who have no connections to the club but who have voiced their opinion on the matter," a statement released on the club's website read.

"Regarding the personal tirade against individuals, the club will work with both South Yorkshire Police and any other supportive body to help identify the instigators. This will include abuse through social media messaging and chanting at grounds.

"Anyone who is found to be involved in such practice will be banned for life from Bramall Lane. Sheffield United will not accept the abuse that is being received by those who have voiced their opinion. They have felt it necessary and have been courageous enough to have made their statement and this should be respected."

The club statement follows confirmation that South Yorkshire Police have launched an investigation into abusive tweets sent to Jessica Ennis-Hill after the athlete said she will demand the removal of her name from a stand at Bramall Lane if Evans is offered a contract.

Evans, who was jailed in April 2012 after being convicted of raping a 19-year-old woman in a hotel room in Wales, was released from prison last month after serving half of a five-year sentence.

The Blades are yet to confirm whether he will be offered a new contract.