CHAIRMAN John Berylson is to undergo knee replacement surgery this year.
Berylson will not be able to fly for up to seven weeks after the operation, which is scheduled for September, and so will miss several of Millwall's home games.
But the American owner has urged fans not to worry about his absence from the stands.
"The fans shouldn't be concerned," Berylson said. "I don't have to worry about delegating either with Ian Holloway, Andy Ambler and the rest of the board running things.
"We'll be talking all the time and I'm still relatively lucid when I'm not on drugs – and when I am on drugs, I won't be making any decisions!"
Berylson will also miss Millwall's season-opener against Leeds United in August because he is overseas.
He added: "My record on the first day of the season is terrible – they've all been losses!
"I'm sort of glad I'm not going. There's an outside chance I'll see a game in late August before the knee operation. I'm also having hand surgery."
Chief executive Ambler added: "John won't be able to travel for a while. However, we'll make sure he gets footage of every game, both home and away.
"He'll be on the phone two or three times a day, as he always is. It's a big operation but nothing changes in terms of the running of the club.
"We wouldn't want the fans thinking John has lost interest in Millwall because he isn't at the games."