Benfica insist that they have received no formal approach from Celtic for Serbian midfielder Filip Djuricic.
Two of Heerenveen's biggest stars Jeffrey Gouweleeuw and Filip Djuricic have left the club.
Heerenveen's Filip Djuricic has turned down a move to Russian giants CSKA Moscow in order to stay in Holland.
Man Utd and Liverpool could go head-to-head for Filip Djuricic after he announced his intention to leave Heerenveen.
Heerenveen midfielder Filip Djuricic wants to focus on his future after missing out on a move to Manchester United in January 2009.