"No, I see no problem at all. For me there is absolutely nothing to complain about," Toennies told German daily Bild with Schalke third in Germany's top-flight.

Gazprom have been Schalke's main sponsor since 2007 and give the Royal Blues 17 million euros (US$23.46m) of sponsorship per year with the current deal running until 2017.

Toennies, chairman of Schalke's supervisory board, also said he has a good relationship with Russia's president Vladimir Putin.

"I am no world leader, but we're pleased when we see each other," said Toennies.

"He always asks about Schalke and we have a good relationship."

German Chancellor Angela Merkel has condemned Russia's annexation of Crimea, but Toennies believes sport should always be kept out of politics.