Ralf Schumacher, his future at Williams looking increasingly uncertain, has accused the Formula One team's technical director Patrick Head of spreading rumours behind his back.
Asked about a report in a German magazine quoting an unnamed Williams boss as suggesting that Ralf had not been the same since a testing accident at Monza last September, the driver pointed the finger at Head.
"It was Patrick," he told reporters at the Monaco Grand Prix. "And if he would have the kindness to show and to explain it then it would be good, and not just to spread a rumour for no reason. To me it's nonsense, nothing else."
The German's contract expires at the end of the year and he has been outqualified in all five grands prix this season by Colombian team mate Juan Pablo Montoya, who is joining McLaren next year.
The German has scored a mere 17 points since his last victory in the 2003 French Grand Prix compared to the Colombian's 53 in the same period.
Ralf missed last year's Italian Grand Prix after admitting after Friday practice that he was still feeling the effects of concussion from his crash.
"He still has problems today," Germany's Auto Bild magazine quoted its unnamed senior team source as saying. "In qualifying in Barcelona in five places he braked 10 to 15 metres earlier than normal."