The 23-year-old had an impressive end to last season as he helped the capital side finish second in the Magners League.
That came after missing the first four months of the campaign with a knee injury.

But McDonald has vowed not to rest on his laurels as he looks to show former Edinburgh coach and new Scotland boss Andy Robinson that he can get better and better.

“Getting selected for Scotland’s training camp was really exciting,” he said.

“It is not the first time that I’ve been invited to train with Scotland’s senior squad, but it will be the first time that I’ve been officially included ahead of either the Autumn Tests or RBS 6 Nations.

“I was really pleased with how everything went last season, but, to be honest, I think it will be a case of new season, new slate. I know I won’t be judged on my performances from last season.

“A rugby player is only ever as good as his last display which is why I’m determined to raise the bar even higher this time around.”