Borussia Dortmund attacker Henrikh Mkhitaryan is considering leaving the club when his contract expires next summer, according to reports.

The 27-year-old has established himself as one of the club's key players since his arrival from Shakhtar Donetsk in 2013, helping Thomas Tuchel's side to second place in the Bundesliga this season.

However, German newspaper Bild reports that he is considering his future for when his current deal runs out in 2017, with a number of Europe's biggest clubs thought to be interested in the Armenia international.

Juventus, Manchester United, Arsenal and Tottenham Hotspur are among the names to have been linked with a move for the forward, who was also wanted by Liverpool before opting instead for Dortmund.

Dortmund have already lost Mats Hummels this summer and are expected to sell Ilkay Gundogan to Manchester City in the coming days.