Chelsea technical director Michael Emenalo has left Stamford Bridge after playing a key backroom role for a decade, the Premier League club said on Monday.
The 52-year-old former Nigeria international has been one of Chelsea owner Roman Abramovich's key lieutenants, overseeing player and manager recruitment during a turbulent period during which he worked with 10 head coaches.
"This has been a very difficult decision to make, but one I believe is right for both myself and my family, and the club," Emenalo said in a statement.
British media reported that relations had been strained between Emenalo, director Marina Granovskaia and manager Antonio Conte, who made clear his unhappiness at the club's failure to sign top-level players in the last transfer window.
"It is with regret that the owner and board of directors accepted Michael's resignation this week," Chelsea chairman.