Köln - Kazuki Nagasawa faces an indefinite spell on the sidelines after tearing the medial ligament in his left knee during 1. FC Köln's pre-season win over a Burgenlandes XI.

The 22-year-old Japanese midfielder, who joined the Rhineland club in January from Yokohama F. Marinos, will undergo an MRI scan on Wednesday, but it is not thought he will require surgery.

2013/14 Bundesliga 2 champions Köln kick-start the new top-flight season at home to Hamburger SV on 23 August.