Borussia Dortmund have confirmed new signing Henrikh Mkhitaryan will miss the start of the season after suffering an ankle injury.
The Armenia international only joined the Bundesliga club earlier this month in a club record €27.5million (£23.6million) deal from Shakhtar Donetsk.
However, the 24-year-old hobbled out of the club's friendly with FC Luzern in Switzerland on Tuesday evening.
The 2013 UEFA Champions League runners-up later confirmed that the playmaker faces an extended spell on the sidelines.
"Henrikh Mkhitaryan has been injured in the pre-season friendly and tests have proved he will be out of action for about four weeks overall," a spokesman told Deutsche Presseagentur.
Mkhitaryan will now miss the DFL-Supercup clash with Bayern Munich on July 21, the DFB-Pokal first round on August 3 and their opening day Bundesliga clash with Augsburg on August 10.