Derby County boss Frank Lampard, 40, is facing one of the biggest tests of his managerial career tonight.
The rookie manager faces a promotion showdown against Leeds United, with both clubs vying for a Premier League spot.
And only days before the game, Frank believed someone may have been trying to get a glimpse of his match tactics.
The all-important Thursday training session was stopped to search for the culprit.
Police attended the Rams training ground and the pitch to try and find the alleged spy.
Cops then found a man with pliers and binoculars by a fence, who Derby claim was sent by Leeds.
Derby response unit tweeted: “Officers have just attended the training ground for @dcfc official after a suspicious male was seen at the perimeter fence.
“Excellent searching conducted and male was located. All checks above board!
“Keeping the team safe to bring home a win against #LUFC on 11th! #SpyingIsCheating.”
But the force came under fire from Leeds fans, who objected to their club being linked with the incident.
One said: “Leeds would have taken more.”
Another added: “Your van is in Leeds colours.”
One fan joked: “If he really was from Leeds I hope you gave him a proper brew with Yorkshire Tea after confirming all checks were above board.”
And one footie fan added: “Probably Gary Rowett looking for another job.”
The Rams face a tough game against Leeds, who currently sit top of the Championship.
But Derby, sitting in sixth, will be buoyed by Leeds’ four game winless run.