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Napoli forward Dries Mertens, who is said to be a transfer target for Manchester United, may reportedly be sold this summer if the club fails to agree a new contract with the player.
According to Il Mattino (h/t Calciomercato.com), discussions about an extension are ongoing between the player's representatives and the Serie A side, although they're also said to have consulted with clubs from across Europe to see Mertens' earning potential.
It's also stated Napoli's willingness to include a significant release clause in the Belgian's contract may be delaying matters and that if the situation is not resolved by the summer, with his terms to expire in 2018, the Partenopei will cash in.