George Clooney has abruptly backed out of his appearances at the Venice Film Festival due to an illness, a representative confirmed to Page Six.

“George has been diagnosed with a sinus infection and is under doctor’s orders to cut back all activities today,” a rep for the “Ocean’s Eleven” actor tells us.

The news came after Clooney, 64, skipped a press junket for his new film, “Jay Kelly,” on Wedneday, and missed a dinner with castmates Adam Sandler and Laura Dern that night.

The “Batman & Robin” star also missed the Netflix film’s official press conference on Thursday.

“As you may know, George Clooney is not going to be here because he has a bad sinus infection,” the press conference’s moderator said, per People .

“We really hope, and I think he should be on the red

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