DT have suggested the 5 Defenders Gary Rowett should take a look at in the Summer:
Aden Flint (Bristol City)
A widely-popular choice as Derby fans call for a new center-back.
Flint was a Conference North defender with Alfreton Town less than 10 years ago, and also had a stint on loan at Northern Premier League side Matlock Town.
The 27-year-old made his name at Swindon Town, where he made 64 appearances, and was snapped up by Bristol City in 2013.
He has played 162 times for the Robins, netting 27 goals.
Ryan Fredericks (Fulham)
Fredericks was on the books at Premier League side Tottenham Hotspur for four years- but featured sporadically.
He was mainly used in cup competitions and was shipped out on loans to Brentford, Millwall and Middlesbrough.
Fredericks, 24, joined Fulham for an undisclosed fee in 2015 and has been a consistent performer, making 52 appearances.
He has yet to score for Fulham and only has one career goal-while on loan at Millwall.
Damien Delaney (Crystal Palace)
Although now the wrong side of 30, Delaney's experience at Crystal Palace could be pivotal to a Derby promotion push.
But do the Rams need an ageing 35-year-old center-back?
Delaney has had a career spanning 546 games and can count Leicester City, Hull City and Palace on his CV.
He has also made nine appearances for the Republic Of Ireland.
Andre Wisdom (Liverpool)
Impressed on a loan spell at Pride Park Stadium in 2013/14, Wisdom is currently at Austrian side Red Bull Salzburg.
Wisdom, still a Liverpool player officially, signed a season-long loan at the Rams to progress his development and became an ever- present in the team- including playing in the 1-0 play-off final defeat to QPR at Wembley.
The 23-year-old, who played 34 times for Derby, has since had loan spells at both West Bromwich Albion and Norwich City.
Bruno Manga (Cardiff City)
Known as being a tough tackler, Manga has been at Cardiff since 2014.
He was a regular for French side FC Lorient for four years before his move to Wales, and has since established himself as one of the toughest defenders in the Championship.
At 28-years-old, Manga, who has five goals in 41 appearances for his nation Gabon, is just about in his prime and looks set to be lured away from Cardiff.
Wales online have reported that the defender will snub a new deal, with manager Neil Warnock admitting he couldn't see him staying.