Here's the quote from his recent book:
That's what the ex-heavyweight champ suggests in his new memoir, "God in My Corner," revealing his trainer gave him a weird-tasting cup of water just before the bout. "I almost spit it out . . . Man, I know this water has medicine in it," Foreman said to his trainer, who denied it was spiked. "I climbed into the ring with that medicinal taste still lingering in my mouth . . . After the third round, I was as tired as if I had fought 15 rounds."
Source: http://www.aolsportsblog.com/2007/05...-muhammad-ali/

I'm not sure why George would say that now after all these years. Every interview I've ever seen of his, he has always claimed Ali just got the best of him.
He's trying to create some buzz for his new book. I can't think of any other explanation to the weird timing of this "drugged" claim.
That's just weird.