Warnock moved from Leeds to Derby in the January transfer window, but his initial progress at the iPro Stadium was halted when he picked up a red card in his first match.
Warnock was sent off for two bookable offences on his first appearance for the Rams against Reading and admits that a forgettable bow for the Rams set him back.
Derby went on to lose Warnock's debut match 2-1 and the left-back felt that he made a lot of supporters angry with his actions.
“It wasn’t the ideal debut that’s for sure,” Warnock said. “It didn’t help me and it probably, in all honesty, set me back a while in terms of confidence.
“When you come into a new club, all eyes are on you, everyone wants you to do well and show why those at the top worked so hard to bring you in.
“To do what I did left a lot of people angry, but you have to look at the bigger picture and tell yourself that it is just one game."
It is true that Warnock has not found the form that made him such a hit at Elland Road since moving to Derby, but he has improved recently and started to show his class.
Warnock has become an integral part of Derby's defence and appears poised to have a shot at making himself a hero this season, despite his poor start.
The Rams are looking to make it into the play-offs and if Warnock can play a starring role, which helps Steve McClaren's side to promotion, then his red card on debut will be quickly forgotten about.