Jose Mourinho's side have stuck signs around their Carrington training base banning the use of UAVs in the area.
The Aon Training Complex will now be a drone-free zone as the Premier League side worry about potential tactical leaks.
The sign reads: "No drones. The use of drones and UAVs over this site is strictly prohibited.
"Anyone found operating a drone over this location will be reported for prosecution and subject to civil action."
A number of teams down the years have complained about the use of drones to spy on training sessions.
France claimed they were spied on as they prepared for the 2014 World Cup in Brazil.
Meanwhile, Honduras accused Australia of espionage ahead of their World Cup play-off clash in November 2017.
FRED'S A RED Fred arrives for Manchester United medical ahead of £52m switch from Shakhtar Donetsk
Now it would appear United have taken preventative precautions as they've barred the use of drones in the vicinity of Carrington.
Back to the football and Fred has arrived in Manchester to undergo his medical ahead of a £52million move.
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