Chelsea lodge complaint with English FA over referee 's `` inappropriate language '' Mark Clattenburg reportedly used racial language towards John Obi Mikel . The incident occurred during Chelsea's 1-0 win at West Ham United on Saturday and the Football Association has opened an investigation into whether it is a breach of its rules or if there are any disciplinary measures that Clattenburg welcomes opportunity to establish facts in case with few precedents .
Chelsea lodge complaint with English FA over referee 's `` inappropriate language '' Mark Clattenburg reportedly used racial language towards John Obi Mikel . FA launch investigation after reading match report from Clattenburg on Monday . Clattenburg welcomes opportunity to establish facts in case with few precedents .