Referees chief Mike Riley has apologised to Everton chairman Bill Kenwright and boss Frank Lampard after they were denied a penalty at the weekend.
The Toffees were left furious in their 1-0 defeat at home by Manchester City on Saturday when midfielder Rodri appeared to escape an apparent handball call, with both the on-field officials and VAR deciding not to penalise the infringement.
Reports on Monday claimed Everton reportedly lodged a consequent formal complaint, while also asking for an apology to Lampard and his squad in the wake of the controversy.
Denise Barrett-Baxendale, Everton's chief executive offer meanwhile expressed 'grave concerns' over the standard of the refereeing in other Everton matches this season, according to The Athletic.