Stewards will spot-check the tickets of Derby County fans after some adult fans have entered the iPro stadium using junior or senior season and match tickets.
The club said tickets will be checked as fans make their way through the turnstiles.
A statement on the club's website said: "Any supporters found attempting to gain entry using a ticket category which is not for the correct individual will have their match ticket or season card confiscated, and they also run the risk of being prevented from obtaining entry to the stadium at future games."
