X-Men 3 star turned down a cameo in Deadpool 3 because of the "mental toll" of playing his character

gamesradar.com:

With an overwhelming number of teased cameos, Deadpool 3 is turning into a who’s who of Marvel characters, but it looks like not everyone is on board. In a new interview, X-Men: The Last Stand’s Vinnie Jones revealed he actually turned down a role in the upcoming movie.

During an interview with Yahoo UK, Jones, known for playing mutant Juggernaut in X-Men 3, said he was approached by director Shawn Levy to appear in the film, but turned it down due to his experience in making the previous superhero flick.

"Funnily enough I just got asked to do Deadpool, the new one now, and I spoke to the director and I just said it's such a drama putting that suit on mentally and physically," he said. "I mean it had its mental toll as well because you're in it and you can't do anything all day, you can only drink through a straw. So we couldn't strike the deal for Deadpool."

Deadpool 3, officially titled Deadpool & Wolverine, welcomes back everyone's favorite Merc with the Mouth Wade Wilson, played by Ryan Reynolds, as he is pulled out of his comfortable life by the TVA and plummeted into the multiverse. The third flick in the series marks Deadpool’s introduction to the MCU as he teams up with mutant Wolverine to defeat a common enemy.

First introduced all the way back in 1965's X-Men #12 by Stan Lee, Juggernaut, otherwise known as Cain Marko, is a strong and durable superhuman almost invincible to any attack. The character first made his cinematic appearance portrayed by Jones in the 2006 flick when he was recruited by Magneto’s villainous group Brotherhood to fight the mutants. Jones notably wore a large metal helmet in the film, which is presumably what took a toll on the actor. 

Later in the interview, Jones mentioned that he did consider appearing in the upcoming superhero film, but the budget didn't fit. "Deadpool's my favorite movie of all f***ing time more or less," said The Gentlemen star. "I really wanted to do it, but they didn't have the budget to put me in the suit."