Warnock, 66, has had a 35-year managerial career, and one of his greatest successes in recent times came when he took Queens Park Rangers to the Premier League in 2011.
The key player that year was, without question, Adel Taarabt. The former Spurs playmaker smashed 19 goals from midfield under Warnock, as the Moroccan international became the focal point of the QPR side, dazzling defences with his remarkable skill and technique.
Taarabt couldn't replicate that in the Premier League, and he left Loftus Road under acrimonious circumstances in the summer, joining Benfica after questions over his attitude.
Now, Warnock has opened up about his time with Taarabt, telling Sky Sports that the playmaker was the worst player he coached in terms of training, admitting that Taarabt was not a good trainer - but he loved playing games, hence his success at QPR.
"Adel Taarabt didn't like training," said Warnock. "But we made sure that he enjoyed the games, and that's why we had a fabulous year at QPR with him, getting us promotion - but not a good trainer!" he added.
It's a shame that Taarabt's QPR career went from firing the club to the Premier League to leaving on a free transfer - but with long-running question marks over his application and work rate, it's no surprise to hear Warnock's comments about what Taarabt was like in training - and at 26, it's unclear whether Taarabt will ever change his ways.