Mainz coach Thomas Tuchel has been forced to emphasise his commitment to the club amid reports linking him with Schalke.
The Royal Blues have appointed former under-17s coach Jens Keller in place of the sacked Huub Stevens until at least the end of the season.
Reports have linked Tuchel to the role next summer, but, with the two teams meeting in the DFB-Pokal on Tuesday night, the Mainz coach claimed he has had no contact with the Schalke bosses.
"I am under contract in Mainz until 2015 and I affirm that every day," he told reporters.
"There can be no doubt that my coaching team and I are getting the utmost joy and the utmost job satisfaction at this point.
"Up until now I have not spoken to any officials at Schalke."
Mainz general manager Christian Heidel claimed no amount of compensation could persuade the club to part with Tuchel, who took charge in 2009.
"Not for 30 or 60 million euros (will we let him go)," he said. "Even if a Russian comes in for him, or a Sheik."