Billionaire Indian steel magnate Mittal was quoted in Saturday's British newspapers as saying that he would be making a bid for full control of the London club on Monday.
Formula One supremo Ecclestone, who holds approximately 62 percent of the club's shares, told Reuters at the Spanish Grand Prix that was not a given.
"Mittal put a statement out to say he was going to buy all the shares on Monday," the 80-year-old said with a smile in the Barcelona paddock.
"But it's a bit like these Murdoch people saying they're going to buy CVC (Formula One's commercial rights holders). They've forgotten to ask if it's for sale."
"Yes, 100 percent. We've never discussed anything about him leaving," said Ecclestone when asked whether Warnock would stay.
"He's never wanted to leave and we don't want to get rid of him."
