The Football Association have written to Avram Grant and asked him to explain his claim that referees Steve Bennett and Mike Dean handed Manchester United the title on a plate.
The Chelsea boss could now be charged with misconduct after he questioned Bennett's integrity following his display in United's match at Wigan on Sunday.
United won 2-0 to ensure they beat Chelsea to the title by two points, but Grant was angry because Bennett failed to give Wigan a penalty when Rio Ferdinand handled in the area or show Paul Scholes a second yellow after he fouled Wilson Palacios.
Grant chose the official press conference previewing Chelsea's Champions League Final match against United in Moscow next week to make his feelings known.
The FA will also study a video recording of Grant's comments, although it is understood the Israeli's guilt is not considered clear cut at this stage.