Clark Robertson: Aberdeen defender out for six weeks

Clark Robertson playing for Scotland Under-21s
Robertson was injured during Thursday's 1-1 draw with Slovakia Under-21

Aberdeen's Clark Robertson will be out for up to six weeks after injuring himself on Scotland Under-21 duty.

The 21-year-old left-back suffered a torn a thigh muscle against Slovakia Under-21s in last Thursday's 1-1 draw.

It's the latest defensive blow for the Dons ahead of the trip to Celtic Park on Saturday, with Russell Anderson also unavailable.

Robertson had had spells on the sidelines due to injury in recent seasons.

A knee injury ended his participation in 2011-12 prematurely and he required a knee operation last term.