Atletico Madrid are tracking the situation of Napoli attacker Dries Mertens.

AS says Atletico chief Andrea Berta is keeping close tabs on the Belgium international, but isn't alone.

Barcelona, Bayern Munich and Manchester United are also watching Mertens this season.

Indeed, Napoli have already rejected a bid from one major European club, with president Aurelio de Laurentiis determined not to lose the attacker.

Now 30, Mertens is understood to be keen to find one final payday as he enters the last years of his career.