The goalkeeper came through the youth ranks at Leeds and is now Derby’s first choice goalkeeper, having appeared 33 times so far this season.
The full-back helped United win the 1991/92 First Division Championship. He joined the Rams after a spell with Italian outfit Torino.
Former England international Warnock spent time at Leeds from 2013-2015 before departing to Pride Park. He is now at fellow Sky Bet Championship side Burton Albion.
Signed from Plymouth Argyle, Conolly went on to captain the Rams. The defender joined Leeds from Derby on a free transfer following our promotion back to the Sky Bet Championship in 2010.
Signed from Charlton Athletic in 1999, Mills went on to play for the Whites in the Champions League. He joined Manchester City in 2004, from whom he had a loan spell at Derby.
Derby signed the midfielder from Doncaster Rovers in 2008 and he joined Leeds from Pride Park four years later. He is now at Crewe Alexandra on loan from Oldham Athletic.
United paid a reported £7m to sign Johnson from Derby in 2001. It proved to be an unsuccessful spell and he rejoined County four years later.
The forward joined Derby after a loan spell in 2008. He spent a lot of his time out on loan from Pride Park before leaving to join Portsmouth. Varney joined Leeds in 2012 and is now at Burton Albion.
The strikers goals helped Leeds reach the Sky Bet Championship Play-Off Final in 2006. He joined Sheffield United in the next transfer window, before moving to Pride Park two years later.