John Mikel Obi talking with referee, Mark Clattenburg
Chelsea say they "regret" the way they handled their accusation that referee Mark Clattenburg used racial language at midfielder John Mikel Obi.
The Blues also regretted the subsequent "intense media scrutiny" faced by Clattenburg and his family, reports the BBC.
The allegations were dismissed by the Football Association and the police dropped their own inquiry.
A Premier League, Match Officials Board and Chelsea statement said: "It is time to draw a line under this incident."