Dicko struck again in the draw with Crystal Palace on the weekend.
The scorer removed his top and ran 80 yards after scoring. His celebrations earned Dicko a booking but his boss didn't seem too concerned.
Appleton added: "I was joking with Nouha that I've never seen him move so quickly. Maybe he's quicker than I thought.
"He's making a habit of getting vital goals now. Two weeks running he's made, got himself into a good position in the box and scored. Nouha took his goal really well and looked delighted with it."