Ilkay Gundogan
Borussia Dortmund midfielder Ilkay Gundogan is expected to leave the Bundesliga sideGetty

Borussia Dortmund midfielder Ilkay Gundogan has called for calm amid speculation linking him with moves to Manchester United and Barcelona.

Gundogan's decision not to renew his current contract at Dortmund – which expires next summer – has prompted the club to listen to offers for the player.

Reports of agreements with Manchester United, medicals with Barcelona and talks with Bayern Munich have created confusion over what the Germany international's next step is going to be.

In an attempt to clarify the situation, Gundogan posted a message on Facebook saying he will make his decision after Germany's European Championship qualifier against Gibraltar on Saturday 13 June.

"Normally I do not address media reports, especially not on Facebook. I want to this time to explain some things and give you a better insight," Gundogan wrote.

"Today I am in contract negotiations here, tomorrow I am having a medical check there. At first I could smile about it, but when there was talk of 'contract poker' and 'rip-off', that painted me in a bad light.

"Yesterday an ominous number [referring to reports of an exorbitant wage demand] appeared in the media and so I have decided to say something about it.

"The 2014-15 season ends on 30 June 2015. Although so far there have hardly been any transfers completed in Europe, rumour to rumour I was supposed to have demanded more and more, putting off making a final decision.

"Forgotten was this; I have one more year on my contract with Dortmund. What is important to me is that I am not gambling financially or using delaying tactics.

"What's next for me personally, I will reveal soon as possible. But only after the season and our important game for the European Championship qualifier with the national team will I decide."

Gundogan's comments suggest he could even decide to remain at Dortmund for the 2015-16 season and leave the club next summer on a free transfer.

Dortmund seem reluctant over such an arrangement, however, and are keen to secure a fee for the player.