West Ham’s head of corporate communications has left the club less than two months after taking the job, Sky sources understand.
Paul Cox arrived at the club in January and was expected to improve the club's public profile after their move from Upton Park to the London Stadium.
West Ham had been in the media spotlight following violence between fans in a match against Chelsea in the EFL Cup in October.
Cox, formerly head of communications at UK Sport, looked after a number of issues relating to the London Stadium, the stadium operators LS185, the London Legacy Development Corporation, the Metropolitan Police, Newham Council and the London Assembly.
Meanwhile, West Ham are working closely with the Metropolitan Police before Chelsea's return to the London Stadium, in the Premier League, on Monday.
Following violent scenes during the EFL Cup game, West Ham produced a five-point plan for games played at the London Stadium.
Since the plan has been in place, West Ham have had nine incident-free games at their new home.
Watch West Ham v Chelsea on Monday Night Football. Coverage begins on Sky Sports 1 HD at 7pm.