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Adnan Januzaj will return to Manchester United next summer after it was revealed Borussia Dortmund do not have the option to buy the midfielder following his loan spell.

The 20-year-old moved the Bundesliga side on Monday in a season-long deal.

He has been given the No.9 shirt and could make his debut at Hannover on September 12 after the international break.

But he is set to return to Old Trafford at the end of the season - regardless of how successful he is at Westfalenstadion.

It is understood United see the agreement as a way to get Januzaj the games he needs to help his development rather than preparing the ground to sell him on.

Januzaj still has three years left on the five-year deal he signed in October 2013 after breaking into the first-team as a teenager.

He made 35 appearances in his first season under David Moyes but only managed 21 last season - his first under Louis van Gaal.

And he went six months without a start before being brought back into the team to play Aston Villa earlier this month.

He scored the winner at Villa Park and kept his place for the next three games before missing Sunday’s defeat at Swansea with a calf injury.

After securing his move to Borussia Dortmund, he said: "Borussia Dortmund are a big club and the fans are meant to be really incredible here. I would like to achieve great things with this team."

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