Klaas-Jan Huntelaar
Klaas-Jan Huntelaar has a release clause in the region of £16.25mn in his Schalke contract Reuters

Schalke general manager Horst Heldt has confirmed striker Klaas-Jan Huntelaar has a release clause in his contract in the region of £16mn.

The Holland international has been linked with moves to Manchester United, Tottenham Hotspur and Malaga in the recent past but Heldt expects the 28 year old to remain with the Bundesliga club unless Real Madrid or Barcelona make an offer.

"Huntelaar does have a €20m buyout clause, and a rich club can afford it. But Klaas-Jan has always stressed that he wants to be a champion. This he can be only with Real or Barcelona in Spain. I do not think he wants to go there. What would he do there? Since nothing more than the weather is better," German newspaper Bild quoted Heldt as saying.

The striker is presently on national duty at the European Championships in Poland and Ukraine and could be in line to start in the team's final group game - a must-win encounter against the Portuguese, in Kharkiv. The Dutch, who are depending on the Germans to defeat Denmark in the groups' other game, must beat Cristiano Ronaldo and the Portuguese by two clear goals in order to progress to the quarterfinals.

Huntelaar, who scored 44 goals from 47 appearances in all competitions for Schalke last season, has admitted to feeling nervous ahead of the crunch clash.

"I am feeling nervous for the last match. I am feeling positive energy for the game, which will be our last chance. We have to score twice and I am convinced that the Germans can and will beat Denmark," Goal.com quoted the player as saying.

If Joachim Low's side play out a draw with the Danes, then Holland will make an early exit from the Euros.

Meanwhile, Huntelaar's Holland team mate and Manchester City midfielder Nigel de Jong insisted the Oranje must seize the opportunity to progress to the knockout stages.

"This situation is a bit odd, three teams could finish with three points, and we might qualify with that. It was not what we expected, but we must seize the opportunity. Portugal are a good team, of course, with good players, especially in attack. But I think we are better and I'm sure we will beat Portugal, but obviously we have to wait for Germany to win, which is a bit uncomfortable, really," de Jong said.