Leyton Orient have rejected an approach from Barnsley to speak with manager Russell Slade, 50, over the vacant manager's job at Oakwell.
Slade took Orient to within one point of the League One play-offs this year.
"Russ is vitally important to this club and after the season we have had, we shook hands on a new contract for him," said Orient chairman Barry Hearn.
Barnsley are looking to replace Mark Robins, who left after a disagreement about the club's playing budget.
"We want Russ at the helm so our response to Barnsley was that they would need to look elsewhere for their next manager," added Hearn.