Mackie tore his hamstring during QPR’s 4-0 defeat against their London rivals Fulham back in September.
And the 30-year-old admits that the double blow of suffering such a serious injury in a heavy defeat, left him struggling to keep his composure.
“On a personal note I was beyond devastated as I obviously knew I had picked up a bad injury - my head was all over the place,” he said.
Mackie is now back in action for the R’s, and he featured in Jimmy Floyd Hasselbaink’s side’s most recent 1-0 victory over Ipswich Town.
With Fulham next on the Championship side’s fixture list, Mackie has called for his teammates to go out and get revenge.
“We owe it to our fans to put on a performance against Fulham,” the forward added. “We were very poor on the night back in September and deservedly lost the game.
“It’s not good enough to lose to a local rival in that manner. We need to roll our sleeves up and remember the feeling we had after the game at Craven Cottage and use that to our advantage.”
If QPR are able to beat Fulham, who have struggled for form of late, they could move to within eight points of the play offs.
The London side made a slow start under Hasselbaink’s stewardship, but they are now unbeaten in five outings, and go into the game against Fulham as favourites to get the three points.