Marco Reus
Marco Reus has reportedly rejected improved terms at Dortmund according to German mediaGetty

Manchester United could be back in the hunt for Borussia Dortmund midfielder Marco Reus after he reportedly turned down a new deal with the German club.

United had been monitoring the coveted winger but hit a brick wall when it was believed he was to remain with Jurgen Klopp's BVB for at least another year.

That situation might now change, after Reus reportedly rejected the chance to sign a new deal with Dortmund, according to German daily Bild, and under the terms of a breakout clause inserted in his current deal, could be available for £27.6m.

The 25-year-old German star still has three years remaining on his contract, but after reports emerged of Bayern Munich's interest, Dortmund moved to secure his services long term.

His refusal could inspire United to launch a bid of their own, possibly using Shinji Kagawa as a makeweight in a proposed deal.

The Japanese midfielder joined United from the German side only in 2012 but remains admired by Klopp and could be deemed expendable by Louis van Gaal.

If Reus is available, Dortmund would likely favour selling him abroad, rather than allow him to follow in the footsteps of Mario Gotze and Robert Lewandowski, who both swapped the Westfalenstadion for the Allianz Arena and strengthened their biggest rivals.

Barcelona have also closely monitored Reus's negotiations as the Catalan club look to go head-to-head next year with Real Madrid's highly-rated forward line.

One club whose antenna will not be raised is Liverpool. The Anfield club was reportedly 'baffled' by their links with Reus earlier this month.

Reus scored 21 goals in 41 appearances last term and Dortmund's sporting director Michael Zorc has previously insisted he would not be leaving the club this summer.

Meanwhile, the potential Arturo Vidal to United transfer saga rumbles on. Reports in Chile have stated a £48m deal could be on the cards, despite the player himself moving to distance himself from a move to United.