Robert De Niro is nursing an injury.

The 77-year-old actor injured his leg in Okla. on Thursday.

Exact details are unclear, but a rep for the actor confirmed the injury to Fox News.

Sources told Fox News that the Oscar winner was not on the set of his upcoming movie "Killers of the Flower Moon," as has been reported. He left Okla. and flew home to New York, where he'll see a doctor on Friday, per TMZ. 

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It's currently unclear whether his injury could delay production on the highly-anticipated movie, as the extent of the injury is unknown.

Robert De Niro

Robert De Niro injured his leg on the set of his upcoming movie, ‘Killers of the Flower Moon.’ (Photo by Kevin Winter/Getty Images)

A De Niro's rep told Fox News that "he was always scheduled to leave for New York for two weeks so his leg injury [has] nothing to do with the production schedule."

TMZ was told by a production source that the crew was told they'd have the day off on Friday, indicating he may have had scenes to film.

SAG-AFTRA did not immediately respond to Fox News' request for comment when asked if a day off is standard following an on-set injury.

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"Killers of the Flower Moon" is based on a book of the same name, which investigates the murders of the native Osage people in Okla. in the early 1920s when oil deposits were discovered on their land.

Famed director Martin Scorsese is at the helm with Leonardo DiCaprio and Jesse Plemmons starring alongside De Niro. 

Robert De Niro, Martin Scorsese and Leonardo DiCaprio

Robert De Niro (left) is currently working on a movie directed by Martin Scorsese (center) and co-starring Leonardo DiCaprio (right). (Getty Images)

De Niro plays William Hale, a cattle tycoon who ordered the murders of several family members in order to gain control of their oil rights.

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The movie will debut on Apple TV+, though no release date has been given.

An Apple representative confirmed to IndieWire that filming began on April 19 with /Film reporting that the shoot will last seven months, stretching into Sept.

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According to multiple reports, the movie was originally set up with Paramount, but the studio was unhappy with the budget. As it has many times in Hollywood now, the coronavirus pandemic also delayed production.