The funnyman was planning to shoot Bone Wars with his The Incredible Burt Wonderstone co-star next year (14).
Carell tells Britain's The Sun newspaper, "It's a huge loss. My thoughts go to his family. He was a great guy, really sweet, generous, kind and obviously a great actor. We were supposed to do something next year. It's a big shock."
The award-winning Tv and film star suffered a heart attack and died in Italy on Wednesday (19Jun13) while vacationing with his teenage son.