Figurines of the extraterrestrial shapeshifters, who appear across several Marvel Comics titles, appear in a boardgame tie-in for the Joss Whedon blockbuster.
The discovery was made by MTV Geek, who stumbled across the game at Jakks Pacific's 2012 Toy Fair in New York City.
It has been speculated that the Skrulls could be the mysterious objects seen falling from the sky in the Avengers Super Bowl trailer.
However, the film's producer Kevin Feige claimed last month that the Skrulls are not the "alien threat" confirmed to appear.
"It's not Skrulls, I've been clear about that," he said. "Beyond that, we want to hide it. The identity of the alien race is not impactful."
Reports that Captain America's nemesis Red Skull (Hugo Weaving) will be part of The Avengers have also been debunked.
Robert Downey Jr, Chris Evans, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Samuel L Jackson and Tom Hiddleston star in The Avengers, which arrives in theatres on April 27 in the UK and on May 4 in the US.
Watch Tom Hiddleston talk to Digital Spy about The Avengers below: