Naughty Dog once worked on a Last of Us Part 2 multiplayer mode, a datamine suggests.
YouTuber Specilizer found multiplayer assets in the game that point to a large multiplayer map, which they speculate could be for a Factions battle royale mode given the size of the map. Considering the development period and release date of the game saw the explosive rise of battle royale games like Fortnite and PUBG, it makes sense Sony would have wanted to explore the genre with a first-party title.
Other assets include a “Listen-Mode-Device”, which could potentially be the way to use listen mode in multiplayer. There are also backpack and armour models specifically for multiplayer.