Heerenveen have signed Serbia centre-back Igor Djuric for around €1.5m from Vojvodina, subject to a work permit.

Coach Trond Sollied had been on the lookout for defensive reinforcements, and is delighted to have snared the 24-year-old.

"He is strong in the air, reasonably fast and can carry the ball forward. We think he can do a good job in Holland," said the club's director Yme Kuiper.

Heerenveen have also signed 29-year-old wingback Gerry Koning, on a free transfer from Volendam on a two-year contract.

The pair join Czech striker Michal Papadopulos as new faces in the squad for the 2009/10 season. "In principle we are ready," added Kuiper.