Leigh Griffiths is substituted during Celtic's 4-1 victory over Aberdeen

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

The Celtic striker came off just before the hour mark of the 4-1 Scottish 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.

Griffiths scored Celtic's opening goal against the Dons

"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."