During his three-year stint at the Mestalla, Zigic lived in the shadow of superstar striker David Villa, although last week the Spaniard signed for champions Barcelona for £34m.
Zigic had arrived in Spain in 2006 at Racing, after netting 71 goals in 110 games for Red Star Belgrade.
He managed 12 goals in La Liga during his debut season before moving on to Valencia but, with Villa often preferred in the lone role up front, his chances were limited.
A loan spell back at Racing during the second half of the 2008/09 campaign resulted in him scoring 13 times in only 19 appearances, while last season he registered nine goals in 28 games for Valencia.
Zigic is a crucial part of the Serbian national side and has been tipped by coach Raddy Antic to shine at the World Cup in South Africa.
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