Kompany feels there's six teams capable of winning the Premier League this season.
"You might have a dream about how your season will go but you don't have a plan," he said. "Looking at it, our position two points clear at the top means the other teams have done an incredible job as well to keep up with it.
"It just shows there is not going to be an easy way to success this year.
"Our Champions League group was the proof of that, the fact we are playing Manchester United in the FA Cup underlines it even more and after beating Arsenal we now have Liverpool in the Carling Cup semi-final."