We only ever saw Joe Manganiello in the post-credits scene to Justice League, a moment that was likely designed to introduce the character specifically because of the plans for him to be included in the new Batman movie.
The story of Ben Affleck’s ill-fated Batman movie is a story unto itself and it’s far from certain that we would have seen the movie even if Justice League had been a critical and commercial success, but the rough road for Justice League certainly didn’t help matters.