The next James Bond movie will feature several familiar faces.
"You have some of the best actors in the world here," he added. "Why wouldn't I have the best coming back?"
Seydoux played Dr Madeleine Swann in Spectre, the most recent Bond film, which was released in 2015.
Fiennes has starred as M since 2012 in Skyfall and again in Spectre. Wishaw stepped in as Q for those same two films, which also saw Harris make her debut as Eve Moneypenny.
It was announced in September this year that Fukunaga would replace Danny Boyle as director of the next Bond movie. Producers said Boyle left due to creative differences.
Fukunaga is the first American filmmaker ever to direct a Bond movie.
The release date of the film has been pushed from November 2019 to 14 February, 2020.
Filming is scheduled to begin on 4 March, 2019 at London’s Pinewood Studios.
Daniel Craig will reprise his role as Bond for the fifth time, in what could be his last performance as the spy.