Queen Park Rangers spokesman Ian Taylor said:
"Joey Barton was involved in an incident in Liverpool city centre in the early hours of Monday morning.
"Barton was on his way home from a night out with his girlfriend when two men sang offensive chants and then proceeded to hit the Rs midfielder.
"Police were immediately on the scene and arrested one man.
"Barton decided not to press charges and left the scene with his girlfriend soon after.
"The club will be making no further comment."
More top news
The mother of Northumberland author Helen Bailey has told a court about her daughter's deteriorating state of mind before her death.
Rafa Benitez praised Matt Ritchie's contagious spirit for each Newcastle United game after the Magpies defeated Rotherham United 4-0.
Police are appealing for help from the public after three men attempted to rob a shop in Newcastle armed with an axe.