The training ground attack left French midfielder Dabo with several cuts and bruises as well as a suspected detached retina.
BBC: Banned Barton to miss six matches
He is currently serving a suspended sentence for a separate assault on ex-Manchester City colleague Ousmane Dabo in a training ground row.
BBC: Barton faces action over assault
Dabo had to go to hospital in May 2007 after a training ground bust-up with Joey Barton left him unconscious and with a bruised eye.
BBC: Man City complete Caicedo signing
Filippo Mancini, 17, the son of Inter Milan boss Roberto, has joined City but French midfielder Ousmane Dabo, 30, has left the club to rejoin Lazio.
Since the training ground assault on Dabo, who now plays for Lazio, Barton has been jailed for a drunken attack on revellers in Liverpool city centre.
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