Blackwell said: "The chairman is a lot better advised on the finances of this football club and if that is what he says, then whatever will be, will be. How do we deal with that? We deal with the football, and that's all I will do until it happens. But I don't know what is going to happen. I really can't say what is in the future, and I can't dwell on it.
"At this stage it's speculation, and you can't live your life based on that. I know because I have experienced that this week from a certain person. He speculated how he was going to change the football club, and then the following day he found he had not got £5 in his pocket."
Blackwell was referring to Sainsbury's comment that he wanted the Crystal Palace manager Iain Dowie to replace Blackwell should his takeover succeed.
"That upset me to a degree," Blackwell added. "But you treat anything like that lightly. He wasn't the owner of this football club. It's like me saying I've got £30m and I'm going to bring a manager in and do this and do that. You take it with a pinch of salt and get on with the football.
With typical humour, he concluded: "I've since swapped from Sainsburys to Tesco. I shall continue shopping at Tesco's even though it's costing me extra mileage to get there."