Inter Milan have signed former Belgium midfielder Radja Nainggolan from fellow Serie A side Roma.

Although Premier League side Chelsea were heavily linked with the player, Nainggolan has signed a four-year deal with an Inter side preparing for their first appearance in the Champions League since the 2011/12 campaign, while Davide Santon and Nicolo Zaniolo have gone the other way.

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Nainggolan, who retired from international football in May after being overlooked for the World Cup, has joined Inter for an initial fee of 38million euros (£33.5m), Roma have announced.

Former Newcastle full-back Santon has moved for 9.5m euros (£8.4m) while the Giallorossi have paid 4.5m euros (£4m) for 18-year-old midfielder Zaniolo.

Inter Milan sporting director Piero Ausilio told his club's website: "The Belgian is a real coup for Inter. He is an important player and one that has always been decisive, particularly during his years with the Giallorossi. He is a top player."