Ross McCormack's first goal for Leeds - and his first league goal in over a year - lifted Grayson's side up to seventh place in the npower Championship and ensured they would remain in the hunt for the final play-off berth regardless of Nottingham Forest's result against Scunthorpe.
Grayson also alluded to champions-elect QPR's pending disciplinary hearing for allegedly breaking Football League rules over third-party player ownership, which could result in a points deduction.
He said: "We always had hope. We never stopped believing we can still achieve it because we know things can happen. One or two things might still happen over the next few weeks but we had to do what we had to do and that's win the game.
"The way we played was really encouraging, really positive and now we just wait and see what happens. We had to make sure we are still in with a chance this time next week and we've done that but for me the manner of the performance was very encouraging.
"The players will learn from the experience. We've had good times and bad times this year and if we get in the play-offs or we don't we'll learn from the experience and be better next year."
Source: PA