MANILA, Philippines – Heavyweight champion Wladimir Klitschko is considering calling out pound-for-pound king Manny "Pacman" Pacquiao since the Ukrainian boxing champion is starting to run out of possible opponents in his division.

In an interview with BoxingScene.com, Klitschko said, "If you look around, who is there for me to fight?"

Klitschko holds the WBA, WBO, IBO and IBF heavyweight title belts and recently defeated David Haye via unanimous decision.

Klitschko said he wants to fight the best in the world – the fighter who holds the pound-for-pound title.

"Then maybe I should be calling Manny Pacquiao," said Klitschko.

But Klitschko quickly adds that the fight will be a mismatch.

"That would be a mismatch because of our size difference," he said.

Klitschko holds a record of 56 wins and 3 losses, with 49 victories coming by knockout.

Klitschko said that he plans to fight the winner of the upcoming match between Dereck Chisora and Tyson Fury. Another option is the comebacking Chris Arreola.