Borussia Dortmund new signing Henrikh Mkhitaryan suffered an ankle injury in a pre-season friendly and may miss the start of the new Bundesliga season, German media said.

On Wednesday, July 17, the 24-year-old, underwent a scan and was said to have up to four weeks to recover.

Mkhitaryan, who cost Dortmund 27.5 million euros ($36 million) from Shakhtar Donetsk, scored in Dortmund's 4-1 win over FC Luzern on Tuesday.

Dortmund are in the midst of their pre-season training and play in a four-team tournament this weekend which includes Hamburg, hosts Borussia Moenchengladbach and European Cup-winners Bayern.