Leigh Griffiths is a doubt for Scotland's opening 2018 World Cup qualifier in Malta next Sunday due to a hamstring complaint.

The Celtic striker came off just before the hour mark of the 4-1 Ladbrokes Premiership win over Aberdeen at Parkhead where he scored the opener with his seventh goal of the season.

The 26-year-old will meet up with the Scotland squad but will be assessed.

"I've been struggling with my hamstring a bit," said Griffiths on Celtic's official Twitter account.

"I'll go away with Scotland and see the physio there.

"I always want to play for my country, I don't want to let anyone down."