Mkhitaryan injures ankle in Dortmund friendly
Henrikh Mkhitaryan is set to undergo a scan on Wednesday to assess the extent of an ankle injury, Soccerway said.
He picked up the problem during Dortmund's 4-1 friendly win over FC Luzern on Tuesday.
The midfielder scored his second goal in two pre-season appearances for the German club in that game, but limped from the field after sustaining the blow.
The 24-year-old rose to prominence last season as he scored a record 25 goals in 29 Ukrainian Premier League appearances to lead his team to the title.
He also helped Shakhtar reach the last 16 of the UEFA Champions League, where they were knocked out by his current club.