Jackson-Shogun fight may have to wait

Just two days after UFC announced Quinton Jackson's last fight of his contract would be against Mauricio "Shogun" Rua and after Jackson had talked about how his knee was healed, he now is saying that he needs surgery on both knees before he can take the fight with Rua.  

Who would you have the most interest in for Fabricio Werdum's next title defense?