The 68-year-old actor plays the titular superhero's loyal butler Alfred Pennyworth in 'Batman v Superman: Dawn of Justice' and 'Justice League', and revealed his character will have a big part to play in Ben Affleck's forthcoming film.
When asked if Alfred will feature more prominently in 'Justice League' than he did in 'Batman v Superman', he said: "Similar, but then, of course, Ben's going to make a Batman film next summer.
"He promises me there's going to be a bit more of Alfred in that. In the Justice League we have seven major lead characters and I'm the butler to one of them. It's clear I will not be dominating that film."
Irons admits he doesn't enjoy shooting huge movies as much as smaller films because he spends most of his time doing publicity or waiting around.
Quizzed on whether he finds bigger films such as 'Batman v Superman' as fulfilling as smaller projects, he added: "Less so, because they're so slow.
"There's a lot of waiting around and then a huge amount of publicity. One spends 70% of the time doing publicity, 10 per cent of the time filming, and 20 per cent of the time waiting.
"I love working with Ben [Affleck] and Zack Snyder. They've been fun."
Irons admits he wasn't bothered by some of the harsh 'Batman v Superman' reviews and was just pleased to see plenty of people turned up to watch the movie.
He added to Variety: "I was very pleased by the numbers. Zack seems to get a hard time from the press, which is strange. I don't know if it has to do with the sort of secrecy that surrounds the making of it all. But the audience liked it, which in the end is all that matters."