In trailers and TV spots, the two characters have been seen going head-to-head – and Boyega has promised that the clash will deliver.
Speaking on US TV show Live With Kelly And Ryan, the British actor was asked what the most “epic scene” in Episode 8 is.
“It would be fighting Captain Phasma, played by Gwendoline Christie,” he declared.
And it seems that Christie needed little help from stunt doubles.
Boyega added: “She can fight, you know?
“I had takes where I was like, ‘we’re cool, right?’”
Boyega is the second Star Wars actor in as many days to appear on the show, after Daisy Ridley (Rey) stopped by yesterday.
In a separate interview, she also recalled an awkward gaffe her father made when meeting Mark Hamill, who plays Luke Skywalker.
The Last Jedi is out on December 14 in the UK.