Ajax captain Niklas Moisander will join Italian side Sampdoria as a free agent in the summer.
Eder scored the only goal of the match as Sampdoria defeated Inter Milan 1-0.
Roma fell to their first defeat in Serie A since November 1 as they suffered a surprise 2-0 home defeat to Sampdoria.
Roma fell to their first defeat in Serie A since November 1 with a 2-0 loss at home to Sampdoria.
Samuel Eto'o opened his goalscoring account for Sampdoria in a 2-0 home victory over Cagliari.
Napoli missed the chance to move level with second-placed Roma in Serie A as they lost 1-0 at Torino on Sunday.