Januzaj went on loan to Borussia Dortmund before being recalled, and he didn't have much of a chance to impress Jose Mourinho in the summer that led to him being shipped out to the Black Cats.
The 21-year-old is under contract with the Red Devils until 2018 and despite other clubs being interested in his services, he remains determined to become a hit at Old Trafford.
Adnan Januzaj is on a season-long loan with Sunderland
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“My goal is always to play at Manchester United. But you should always keep your ears open and keep options open," he told The Sun.
“You cannot play for the future. I have a contract until 2018. There are many clubs interested. It is up to me to work, the rest will come.
“I never had any problems with Mourinho. He is a top coach. Last summer, they asked me to play a year on loan, to get some game-time because I had not played for a year.
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Adnan Januzaj has scored one goal in 17 appearances for Sunderland
Adnan Januzaj says he has no problem with Jose Mourinho
“I joined Sunderland for playing time and to continue to make progress. After this season we’ll see again.
“I’ve always had confidence in my football qualities. I’ve never been afraid of anything.”
Januzaj has only netted once in his 17 appearances for the Black Cats this season.