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
Following the Grenfell Tower fire, Thirteen Group has been checking its 20 tower blocks.
A look ahead at the weekend forecast for the Tyne Tees region.
Chantelle Connelly, 27, denies GBH on the 22-year-old she had been speaking to in a Newcastle bar in October