Pedro de la Rosa has revealed he has "no idea" if he will be called up by Sauber to race on the streets of Valencia this weekend.
The veteran Spaniard, who is McLaren's reserve driver, was called up at the last minute in Canada almost two weeks ago when Sauber regular Sergio Perez fell ill after Friday morning practice.
Sauber managing director Monisha Kaltenborn this week then said that although Mexican rookie Perez, 21, is now fully recovered from his Monaco qualifying crash, 40-year-old de la Rosa is once again on standby.
"I am being constantly asked if I'm going to race in this (European) Grand Prix, and actually I don't have the faintest idea," said de la Rosa on Wednesday. "I would like to clarify that I am McLaren's reserve driver and indebted to them before any other team.
"Whatever happens depends on if McLaren lets me, and actually I don't want to speculate as I find it a lack of respect for Sergio Perez, who has said he is perfectly well," he added.