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Fans may notice something strange about Jeremy Renner in the upcoming movie “Tag” as one of his co-stars revealed an on-set injury forced them to do some CGI work on him.

“Tag” star Jon Hamm appeared on “The Ellen Show” last week to discuss the film, where he revealed that Renner broke both his arms early on in filming the movie. In order to not stop production while the “Avengers” star healed up, Hamm noted that he was given green casts that allowed editors to use CGI to make his arms look healthy.

“Jeremy Renner, who broke both of his arms at the same time. Day 3 of production. We had… 40 more days to go?” Hamm told Ellen with a laugh. ”Keep in mind, this is a man who has done a hundred ‘Avengers’ movies and been fine. And he does a movie about playing tag… both arms. Like firewood, just snapped like a matchstick.”

For those who don’t know, “Tag” is based on a true story about a group of adult men who have been engaged in the same game of tag for 30 years. Renner plays the target of the group having never been “it” in all that time.

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Jon Hamm revealed secrets about Jeremy Renner in 'Tag.' (Reuters)

Renner revealed to Variety that he was injured on the set of the film back in July of 2017 after it was incorrectly reported by some media outlets that he was injured while filming the recent box office hit “Avengers: Infinity War.” Renner’s character, Hawkeye, didn’t appear in the first installment of the superhero team up, but he is expected to show up in the second installment, which filmed at the same time.

“I’m doing a job [‘Tag’] that isn’t really requiring a ton of stunts. It’s not an action movie; it’s a comedy. It just happens to have a few stunts in it. So I don’t have to beat a whole lot of people up or do anything crazy. So it won’t really affect my job. … It affects how I get dressed in the morning. I can’t tie my shoes, but outside of that and everything else, I can kind of get by,” he told the outlet.

Fortunately, based on the trailer for the film it doesn’t seem like this will be a noticeable use of CGI like, say, Henry Cavill’s mustache in “Justice League,” which had to be digitally removed in reshoots so that he could also film the upcoming “Mission Impossible 6.”