From FiveOuncesofPain.com:

For a long time now fans have been clamoring to see the pound for pound best fighter in the world, Anderson Silva, take on his teammate and close friend, WEC middlweight champion Paulo Filho. Both fighters have dismissed the fight in the past, saying that they would never fight one another due to their friendship. But Ed Soares, the manager for both Anderson Silva as well as Paulo Filho was recently a guest on MMA Weekly Radio and did not rule out a possible fight between the two top middleweight fighters sometime down the road:

“If that’s the fight that the world wants to see, then I guess we’re going to have to sit back and talk about it,” Soares said. “I think that’s going to be a hard one to get across to both sides. They’re friends, they’ve been together. But at the end of the day, it’s a business, and sometimes you’ve gotta go in there, and you shake hands. They’ve been on each other for free in training. I can just tell you that it would really have to be something that makes sense for both guys.”

To be honest with you I have never really seen the Fihlo that many people rank as the number 2 middleweight in the world. Maybe it's because he had the substance abuse issues and was not into fighting mentally or physically but until he proves he is the fighter that some believe he is I don't think he warrants a shot at Silva to begin with. I am interested to see him fight against Sonnen again. I thought he was being handled in that fight and got extremely lucky to win that fight.