The digital version of Lego City Undercover requires you to have an external hard drive for your Wii U, Nintendo has cautioned.

The publisher has warned those wishing to download the title from the Wii U eShop.

"An external hard drive is required to download this software," a notice on the game's official site reads. "Visit support.nintendo.com for information about storage options."

Reports suggest the open-world adventure weighs in at a hefty 22GB - we're checking with Nintendo now to make sure.

Basic 8GB Wii U consoles have just 3GB free space after installing system software and creating a user profile, Nintendo revealed last year.

Premium 32GB Wii U consoles get 25GB of usable space - suggesting that you should just about be able to squeeze Lego City Undercover on. That's bearing in mind you've got no other software or apps downloaded.

Nintendo doesn't make a distinction between the two models, simply stating that Wii U owners in general will need an external hard drive.

We'll update when we hear back.