Derby County have said the person police spoke to acting suspiciously outside their training ground on Thursday was an employee of Leeds United’s football staff.
The sixth-placed Rams visit the Championship leaders on Friday.
They said in a statement they were “in discussion with Leeds club officials in relation to this incident”.
The BBC has asked Leeds United for a response, while Derbyshire Police said no arrests have been made.
In a statement, they said officers were called to Derby’s training ground on Thursday morning and a man was spoken to at the perimeter fence.
The statement added: “Officers conducted routine checks which were all above board. Despite media reports, no damage to the fence was found, and the man was stopped outside the grounds.
“No arrests were made and the man was sent on his way.”
The English Football League have told the BBC that it is a matter for the two clubs to resolve.