Has an award-winning American filmmaker just revealed he is a Watford FC fan?

Zack Snyder, best known for his action and science fiction films, shared a behind the scenes featurette from his movie Justice League – which ends with a shot of the director holding a personalised Hornets mug.

The 90-second teaser (below) shows glimpses of the new action and features a sneak peek at scenes between Bruce Wayne (Ben Affleck), Aquaman (Jason Momoa), Wonder Woman (Gal Gadot), The Flash (Ezra Miller), and Cyborg (Ray Fisher).

Last day filming in the UK. It has been an amazing shoot. Big thanks to everyone involved! #JusticeLeague pic.twitter.com/TEjEdlo81u

— Zack Snyder (@ZackSnyder) October 7, 2016

The film has partly been shot at Leavesden studios, and Snyder has regularly been seen grabbing coffee from nearby Fred & Ginger.

However, it may be a while before we see Snyder at a Hornets home game as filming has moved to Iceland.

READ MORE: Independent coffee shop to feature in superhero blockbuster.

“I just want to say a quick thanks to my cast and crew, and thank you U.K. It’s been amazing,” Snyder said in the video.

“Justice League” will be the fifth installment of the DC Extended Universe, following “Man of Steel,” “Batman v Superman: Dawn of Justice,” “Suicide Squad” and “Wonder Woman.”

The mug didn’t go unnoticed by eagle-eyed Hornets fans, who took to Twitter to express their delight.

The production on “Justice League” will now finish up filming in Iceland.

The film will be released in cinemas on Nov. 17, 2017.