The 52-year-old actor, who worked with Hoffman in 'The Ides of March', has been struggling to overcome the grief of Hoffman's death on Sunday due to an apparent drug overdose, reported New York Post.
Speaking to the reporters during the premiere of his new film 'The Monuments Men', Clooney said that he is struggling to come to terms with Hoffman's "senseless" drug-overdose death.
"I wanted to start by saying it's very odd to be here in New York, particularly a couple of days after a good friend of ours has passed away. It's senseless and it's sad, but he will be greatly missed," Clooney said.