[UPDATE 2] Assassin's Creed Unity, Far Cry 4, and The Crew have now returned to Steam. It remains unclear why they were removed.

[UPDATE] Following the publication of this story, it was brought to our attention that games such as Assassin's Creed Unity, Far Cry 4, and The Crew are also unavailable through Steam's United States store. GameSpot has contacted Ubisoft for comment and will update this page with anything we hear back.

The original story is below.

Three of the biggest Ubisoft games still due for release this year will not be arriving on Steam in the UK, the publisher has confirmed.

Far Cry 4, Assassin’s Creed Unity and The Crew will only be available to PC gamers in Britain via Ubisoft's uPlay store. However, a Ubisoft representative told PCGamesN that the decision was not final.

“We’ve been in discussions with Valve about Assassin’s Creed Unity but for the time being the game is not available via Steam in the UK,” Ubisoft said.

“In the meantime, UK customers wishing to purchase the game digitally can do so by visiting the Uplay store, our retail partners or other digital distributors.”

The trio of titles represent Ubisoft's biggest new games during the crucial holiday period this year. Assassin's Creed Unity comes to the UK on November 11, followed by Far Cry 4 on November 21. Then, on December 2, MMO racer The Crew will ship across the UK.

While the Steam editions are not available in the UK, they can still be purchased digitally via uPlay and GreenManGaming.

The reason for the Ubisoft games' absence on Steam is not clear, though games tend to not appear on the platform due to legal reasons. In 2011, EA removed some of its games from Steam due to disagreements over DLC royalty rates.

Steam owner Valve has run into various disputes regarding EU law in the past.