Grosskreutz adds to Klopp worries

[JTG]

Borussia Dortmund may have another injury worry on their hands after Kevin Grosskreutz suffered a knock in a friendly last night which could see him be the fourth first-team player to be sidelined.

[Folami David]

I don't see any reason why Players should pick up injuries in Friendly matches. Then what is it a friendly match for?