Miika Koppinen needs more time than first presumed to recover from his knee injury.

The left knee, with an operated meniscus and torn-off back crucial, was not strong enough for normal training. Wednesday it failed again.

"He has been very unfortunate, and will need another four to six weeks before he's fully restituated. The strength in the knee is good, but the sense of balance isn't as it should be. That leads to an irritated crucial," RBK Medic Torbjørn Grøntvedt tells local Trondheim daily Adresseavisen.