Jozefzoon spurned a move to Leeds in favour of Derby, and angered Leeds owner Andrea Radrizzani in the process.
Derby host Leeds on Saturday evening in the Championship, both fresh off opening weekend victories.
Radrizzani spoke of his anger towards the winger, telling the Yorkshire Evening Post: "We received the contract from the club (Brentford) and we had written approval from the agent.
"Then, on the way to the medical check here, they change ideas and go to another club. Honestly, I’m happy he didn’t come here. Good luck to him but we don’t want people like this."
Jozefzoon was named on the bench for Derby's first game of the season against Reading, although did not get on.
This weekend he is Derby's trump card, a player with extra motivation to prove a point.
Leeds owner Radrizzani has provided Jozefzoon the increased reason to want to make Leeds pay, and the Italian may come to regret the timing of his outburst just one week before the game against Derby.