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(Image: GETTY)

An appeal has been made by former teammate Dominic Matteo for more information about the attacker.

He wrote on Facebook: “Can any Leeds/Yorkshire based lads help please?

“In the early hours of Saturday morning Leeds legend Gary McAllister was attacked in Leeds by an unknown assailant.

“The attack was totally unprovoked and very vicious. Gary was hospitalised, lost three teeth and had plastic surgery on his lip which needed 12 stitches.

“The attacker is thought to be American and due to the severity of the injuries may have been wearing a ‘knuckleduster’.

“Can you please share. If you know anything or may know someone who may have seen or know anything that can help find this cowardly p**** please contact West Yorkshire Police.”

McAllister was outside a bar on Call Lane, in Leeds city centre, when he was attacked at around 4am on Sunday.

He is believed to have been waiting for a taxi when he was struck.

(Image: GETTY) (Image: GETTY)

A statement from Leeds Police read: “The initial report was that a man, aged in his 50s was stood outside a bar when a man approached him and punched him in the face, causing injuries that required hospital treatment.

“We are currently arranging to speak to the victim to take fuller details of the incident and will be progressing the investigation to identify the person responsible.”

McAllister won the old First Division in 1992 with Leeds who he played for from 1990 to 1996.

He went on to play for Coventry and Leeds before hanging up his boots.

McAllister has managed at Coventry, Leeds and Aston Villa while he is currently Steven Gerrard’s assistant at Rangers.