He needs to forget about going for the knock out. Haye has power but nothing to compare to the K brothers so he'll just punch himself out if he tries to end it early. Just touch him to the body and move. It will basically be a 36 minute aerobic workout
Be agressive and high punch volume output when on the inside. Psychologically break him down in the pre fight, like he did with Enzo. He needs fast feet and good movement, circling in and out of range as a defence. But take this on the inside because Valuev is the worst on the inside, so fight his weakness. Haye needs to get better on the inside though because his strength is mid range, which does not cut it against Valuev as he gets touched off by a poker jab if he tried that tactic.
Method One: Do lots and lots of 8 mile runs in training.....then do another one in the ring. (Oh yeah, and remember to hit him a few times) Job done.
When Haye gets in a clinch he headbutts his balls. Valuev's keys are to strangle Haye with his soggy body hair, and use his balls like a swinging mace to split Haye's lips. Valuev will ko the spineless Haye with a left nut to the chin.