He was left out of United's squad for their summer tour of the USA and Sociedad president Jokin Aperribay confirmed he wanted the youngster.
Januzaj's emergence was probably the highlight of David Moyes' ill-fated nine months in charge at Old Trafford - but since then, the Brussels-born player has seen his career massively stall.
OPEC supply concerns drag oil prices lower
That's the opposite of the "shock and awe" strategy of deeper cuts Goldman Sachs Group Inc. said producers should be adopting. Brent for September settlement fell 6 USA cents to US$46.67 a barrel on the London-based ICE Futures Europe exchange.
Januzaj sealed his exit from United by completing his transfer to La Liga outfit Sociedad, both clubs confirmed on Wednesday night.
And the Belgium worldwide took to Instagram to post a message to United's supporters after being unveiled as a Sociedad player, choosing to only pay tribute to a section of the coaches at Old Trafford.
Joe Scarborough quits the GOP over Trump
Trump has repeatedly used the term "fake news" largely for any coverage criticizing him or his administration. Republicans, he said, turned the other way. "What have you heard from Republican leaders today?" "Nothing.
Januzaj originally joined United as a 16-year-old from Anderlecht and scored twice against Sunderland in 2013 to cement his status as a player to watch.
Real Sociedad - ironically once managed by Moyes - finished sixth in La Liga last season and qualified automatically for the group stages of the Europa League. "Thank you to some of the coaches and staff that work at Manchester United to make it such a great club!"
Deemed good enough to take Ryan Giggs' number 11 shirt, Januzaj signed a five-year contract extension that was not due to expire until 2018.
No women allowed: Japan's Okinoshima island becomes UNESCO site
Takayuki Ashizu, chief priest of the Munakata Grand Shrine said the island would never become a tourist attraction. Only a few people are allowed on the island, that too for a yearly festival that lasts for just two hours.
Rob is ESPN FC's Manchester United correspondent.