Newcastle United midfielder Joey Barton was today starting a six-month jail sentence for his part in a brutal, alcohol-fuelled street attack.
The 25-year-old punched one man up to 20 times and left a 16-year-old boy with broken teeth, Liverpool Crown Court was told.
Despite the assurances of his club manager Kevin Keegan that Barton is a changed man, Judge Henry Globe, who described the player as 'aggressive and disgraceful', sent him to prison.
Newcastle are currently considering the implications of Barton's sentence, which also included four months concurrently imposed for affray and £2,500 compensation order to his 16-year-old victim.
'Newcastle notes the sentence passed to Joey Barton at Liverpool Crown Court,' said a statement.
'The club is considering the verdict and will be making no further comment at this moment.'
Barton, cousin Nadine Wilson, 27, and brother Andrew Barton, 20, were captured on CCTV in a number of violent incidents in Liverpool city centre on December 27 last year.
It took place as Barton was on bail for an alleged assault of former Manchester City team-mate Ousmane Dabo, 31, and a separate criminal damage offence.
At around 5am the player, who had consumed 10 pints of lager and five bottles of lager, went into a McDonald's restaurant with his brother and Wilson.
The court heard Wilson became involved in a confrontation with a group of youths and the row continued outside the restaurant, with Barton caught on CCTV knocking an unidentified man to the ground.
He then straddled the man, and punched him four or five times as Wilson threw food at the victim before Barton punched him up to 15 times more.
Minutes later, the player attacked 16-year-old Jordan Spencer, punching him in the mistaken belief the youth had slapped Wilson. The punch broke a number of Mr Spencer's teeth.
Ian Harris, prosecuting, described the incident as 'violent and cowardly'.
The court was told the Barton brothers had been goaded by remarks about their half-brother Michael, who is serving life for the racist murder of Anthony Walker in Huyton, Merseyside, in 2005.
Stuart Driver QC, for Barton, said his client had been subjected to 'truly obscene' references to his half-brother by other city centre revellers.
He said: 'Minutes of build-up led to a few seconds of violence.'
In his character reference, Keegan described how Barton was a changed character from when he knew him while Manchester City manager.
He said: 'Had I been asked to give character evidence for him then, I probably would not have been able to do so.
'But he has taken stock of his life, he is more thoughtful in his actions and character. He is a far more responsible individual.'
Peter Kay, of the Sporting Chance clinic in Hampshire which has been supporting Barton since January, said the player had an alcohol problem.
Judge Globe told Barton: 'Without doubt, the most serious of the three offenders is you.
'You acted in an extremely violent and aggressive manner.
'You have a high profile as a footballer and you know that draws attention to you. Yet you drank to excess and behaved in an aggressive, disgraceful manner.'
Wilson, of Childwall, Liverpool, was given a six-month sentence for ABH and two months for affray, suspended for two years.
She was also given a 12-month supervision order and instructed to carry out 12 months unpaid work.
Andrew Barton, also of Foxbank Close, Widnes, was given a four-month sentence for common assault, suspended for two years, and a 12-month supervision order.
BAD NEWS BARTON:• 2004: February - Barton picks up the first red card of his career in Manchester City's FA Cup fourth-round tie at Tottenham. After being booked for a late challenge in the first half, the midfielder is shown a second yellow for dissent.
April - Barton storms out of Eastlands before kick-off after being axed from the side to face Southampton.
July - Blasted by manager Kevin Keegan for causing a mass brawl in a pre-season friendly at Doncaster.
December - Stubs a lit cigar into the eye of young team-mate Jamie Tandy during club's Christmas party. Fined six weeks' wages by City. Forced to pay four weeks' salary - approximately £60,000 - immediately, with a further two weeks suspended for a year.
• 2005: May - Barton breaks leg of 35-year-old pedestrian while driving his car at 2am in Liverpool city centre.
July - Involved in an altercation with a 15-year-old Everton fan at City's team hotel in Bangkok, where the team are playing in the FA Premier League Trophy. Is fined eight weeks' wages by City after being found guilty of gross misconduct. Accepts punishment and agrees to undertake a programme of rehabilitation.
• 2006: September - Drops his shorts in the direction of Everton fans following City's 1-1 draw at Goodison Park. Merseyside Police investigate the matter.
December - Barton is shown the second red card of his career - this time a straight red - for a wild two-footed lunge on Abdoulaye Faye in City's 2-0 home defeat to Bolton.
• 2007: March - Arrested on suspicion of assault and criminal damage in an incident involving a taxi driver. Bailed until May pending further inquiries.
May - Suspended by City for the rest of the season after a training ground altercation with Ousmane Dabo, which leaves his team-mate needing hospital treatment.
October - Appears at Trafford Magistrates Court to answer a charge of assault on Dabo. Indicates he will plead not guilty at a full trial, which is expected to take place in June 2008.
November - FA investigate Barton's tackle on Sunderland's Dickson Etuhu in the Wear-Tyne derby but decide to take no action.
December - Causes controversy by describing the St James' Park crowd as 'vicious'.
Arrested in Liverpool city centre after a late-night incident and later charged with common assault and affray. Remanded in custody and misses Newcastle's New Year fixtures, released on January 3.
• 2008: May 20: Jailed for six months after admitting common assault and affray.