The signing that could cost Chelsea nothing in June

Mertens' contract with Napoli runs out in June 2020. That is to say, from this date, whoever wants to, can sign the player as a free agent.

Chelsea think this is an exceptional opportunity. The source states that the club are already moving to get him to sign for them.

Blues coach, Frank Lampard, has given the go ahead on his arrival. The coach thinks that he could bring something different to the team.

However, they are not the only ones interested in Mertens. Inter, Arsenal and Borussia Dortmund have also all asked for the footballer.

There are a lot of European clubs following the Napoli player. And they are aware that you can't sign a player like Mertens every day without paying a single euro more than the player's salary. The player has the last word.