The Professional Game Match Officials Limited is investigating after referee Mark Clattenburg joined a management agency that also represents players.
Catalyst4Soccer announced last week via Twitter that Clattenburg was a new client after he was granted permission by the PGMOL, the group responsible for officials in English football, to gain help in managing his off-field activities such as after-dinner speaking and charity appearances.
However, reports suggest that the PGMOL only became aware that the agency also represented players following the announcement regarding Clattenburg.
Due to concerns about potential conflict of interest and how the arrangement may be perceived, the PGMOL are now looking into the matter.
Catalyst4Soccer’s client list includes Manchester City goalkeeper Willy Caballero, who was on the bench for their 2-1 loss to Tottenham in the Premier League at the Etihad Stadium on Sunday.
Clattenburg refereed that game and was at the centre of controversy after he awarded a penalty to Spurs having judged Raheem Sterling to have been guilty of a handball, something replays cast considerable doubt over.
The referee was booed off the pitch by unhappy home supporters, who feel a number of decisions did not go their way through out the match.
City manager Manuel Pellegrini said after the game that he did not feel Clattenburg was the correct appointment for the match, having also refereed the reverse fixture between the two sides earlier in the season.