Reports in Russia suggest that the Premier League trio are stepping up their efforts to land the player - dubbed the Iranian Messi - in a £5m deal.

Rubin Kazan remain adamant that they will do everything they can to keep hold of the promising striker, 20, but have also admitted they will consider official offers for the Azmoun.

Rubin CEO Ayrat Garayev told Izvestia: "Sardar Azmoun is a Rubin player and has a valid contract with our club.

"We are waiting for his return from the Asian Cup and looking forward to having him for the remainder of the season.

"We have had approaches for Sardar, but I see no reason to discuss them until they become official."