Darragh MacAnthony says Peterborough United would only listen to Premier League offers for any of the club's players.
Posh have enjoyed a fine first half to the season under Darren Ferguson and are pushing for promotion to League One.
Several players have been linked with January moves, with top scorer Aaron McLean reportedly a target for Charlton Athletic and Leicester City.
But Peterborough chairman MacAnthony says any bids from Championship clubs will be given short shrift as he looks to keep the London Road squad intact.
"I have a simple message for Charlton - and any other clubs thinking of sniffing around our players for that matter," MacAnthony told the Peterborough Evening Telegraph.
"And that is 'Don't bother us unless you are a Premier League club and you're offering a serious amount of money'.
"We're not prepared to listen to offers from clubs outside the Premier League.
"We're trying to build a team capable of winning a couple of promotions and we're getting there, so we've no intention of selling key players."