In an interview with the Hollywood Reporter, Colossus actor Stefan Kapicic spoke of how Reynolds had simply started putting on a motion-capture suit one day, much to his surprise.
“I didn’t know who was going to be doing the voice of Juggernaut. Ryan is always there when I’m working on Colossus, helping me with the lines and giving me ideas,” Kapicic said, “Then I saw Ryan getting into the CGI costume and I’m like ‘What’s going on man, did I miss something?'”
In the credits of Deadpool 2, The Juggernaut is listed as being portrayed by “himself”.
Deadpool 2 is out on 4K, Blu-Ray and DVD on the 21st of August, including a ‘Super Duper $@%!#& Cut’ which adds an extra 15 minutes to the run time..
Source: Hollywood Reporter