The Dutch striker has struggled for goals so far this season, though produced the winner on Sunday for the 2-1 triumph.
Afterwards, Monchi smiled: "He is a cool frog, I have a lot of confidence in him. Sooner or later you know that his goals are going to arrive. If I had to sign him again, I would have done so."
De Jong also remarked: "It was a good match of ours. It was a great goal for me and for the team. This game is always special, grabbing the three points was important.
"I am always committed to the team. I will continue to think about this great moment for the time being."