Former UFC heavyweight champion Junior dos Santos is impressed with how Fabricio Werdum fought Cain Velasquez to snatch the belt earlier this year. However, 'Cigano,' who fought Velasquez three times and lost twice, believes Werdum hasn't seen the best of Cain just yet and should be careful in their rematch, as Combate reported.

"I think Werdum did well in his last fight, but in my opinion he did not fight the same Velasquez I fought. Velasquez was exhausted in the first round. That was a complete surprise for me. He was exhausted in the first round. That's unbelievable for someone like him, who fought 10 rounds against me. In the fifth round he was hopping like a kid, so that was odd."

Even though the rematch between Werdum and Velasquez has been announced by the UFC, the place has not been established yet. Since many believe the high altitude of Mexico City played a big factor draining Velasquez's cardio, Dos Santos thinks Cain will win the second encounter, provided he doesn't gas again.

"If Velasquez shows up in his usual shape. I think he beats Werdum. But if Werdum keeps the belt and I win my fight. I could be next. It could happen."

Junior dos Santos is expected to take on Alistair Overeem at UFC on Fox 17 on December 19, in Las Vegas.