Summary:
Chelsea and Manchester United have been credited with helping the club to snare Portugal star Luis Suarez.

Full article:
Manchester United have been told they will have to pay the £37m buy-out clause for Sporting Lisbon midfielder William Carvalho. United have tried to bargain the price down while Chelsea have shown interest too but the Portuguese club have warned he won't be sold on the cheap. VIDEO Scroll down to watch United target Carvalho take out two players with one tackle . In limbo: Manchester United must cough up to capture Portugal star William Carvalho . Attracting interest: Chelsea have also expressed an interest in the sporting star . Sporting club director Augusto Ignacio said: 'It’s not like the old days when players left Sporting at any price. 'The termination clause ensures a great deal for Sporting. I am very pleased with the negotiations.' Meanwhile, United have also been credited with interest in Fiorentina's Juan Cuadrado and Juventus midfielder Arturo Vidal. VIDEO Van Gaal will rebuild United - Yorke .