Johnson confirmed Hasselhoff's involvement in the project Wednesday posting a video of himself over social media speaking with the actor using FaceTime.
"Pleasure to officially welcome the original #Baywatch gangsta himself David Hasselhoff to our movie!," Johnson captioned the post on Instagram.
"#Baywatch is the most successful TV show of all time and from the day we announced we were turning it into a movie, 'The Hoff' has been our greatest supporter."
"I don't know if the world is ready for the both of us, Are you ready?," Johnson asks the 63-year-old in the clip.
"C'mon man The Rock and The Hoff I was born ready!," the former "Baywatch" star responds back.
Directed by Seth Gordon, the upcoming film adaption follows an experienced lifeguard played by Johnson who is forced to join forces with a young upstart played by Zac Efron in order to save their beach from an environmental disaster.
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Hasselhoff famously portrayed lifeguard Mitch Buchannon, the role Johnson has taken over, alongside Pamela Anderson in the original television series which ran from 1989 to 2001. Hasselhoff also produced the series.
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