A video was posted to his production company's Instagram account showing the actor in stunt training, but it was the caption that gave the biggest hints that he is about to become Marvel's next leading man.
The caption to the video that show's Isaac throwing some people around a gym, featured the hashtag "#TheOneYouSeeComing", which happens to be a direct quote from the character in the comic book.
It was announced last year that Marvel and the Poe Dameron actor were in negotiations for him to star as the titular hero, but nothing had been confirmed by those in charge.
Not a lot is known about the series so far, but according to those in the know, the character is Marvel's answer to Batman.
In the comics, Moon Knight, aka Mark Spector, is a former boxer, CIA agent and mercenary who, after being betrayed and killed, is given a second chance at life by the Egyptian moon god Khonshu.
Resurrected with superhuman abilities, he uses his newfound powers to fight crime.
Jeremy Slater, who adapted The Umbrella Academy for Netflix, is in line to develop the Disney+ series and lead the writing team, but as yet no other names are attached to the project.
Moon Knight will air on Disney+.
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