Manchester City could be at the centre of a potential Fifa investigation amid allegations that Monaco forward Kylian Mbappe has been tapped up.

Monaco are threatening to report an unspecified number of “important European football clubs” that they believe have made illegal approaches for the teenage French sensation.

City, Real Madrid, Paris St-Germain and Arsenal are among the clubs who are said to have been chasing Mbappe’s signature.

But it is understood City are the only English club accused of approaching the 18-year-old and his representatives without permission. City have so far declined to comment but it is understood they are confident they have not breached any rules and believe they have a good working relationship with Monaco and are keen to maintain that.

City have already signed Portugal playmaker Bernardo Silva from Monaco this summer but they have had a new £44.5 million bid for left back Benjamin Mendy rejected by the French champions, who insist they want more than the £50 million that City paid Spurs for England right back Kyle Walker. Jose Mourinho, the Manchester United manager, has raised eyebrows at City’s outlay on Walker and claimed his club will not pay the inflated fees some rivals are prepared to stump up.