Aberdeen striker Sam Cosgrove faces being out until December with a knee problem.

The 23-year-old sustained the injury during the Scottish Premiership side's friendly draw with Hibernian and faces up to four months on the sidelines.

Cosgrove - who turned down a £2m move to French second-tier club Guingamp this summer - scored 23 times last term and has 44 in 87 games for the Dons.

Aberdeen start their top-flight campaign against Rangers on Saturday.