Season Ticket Holders are being reminded to make sure they bring their new cards when they head to Pride Park Stadium for Saturday's meeting with Leeds United.
Last year's cards will not be valid from this weekend.
The club’s Season Cards were distributed from Tuesday 31st July with the aim of ensuring all supporters received their new card by Monday 6th August.
If any supporters have not received their new Season Card, they are advised to make direct contact with the Derby County Ticket Office.
* Calls cost 13p per minute, plus your phone company's access charge.