Having already represented Scotland at all age-grade levels as well as 'A' level, De Luca was called up to the Scotland squad for the 2008 Six Nations Championship. He made his debut for Scotland against France in the first game of the 2008 Six Nations Championship. De Luca held on to his position for the following game against Wales. He had a difficult introduction to international rugby as he struggled throughout the 2008 RBS 6 Nations as part of an under-used and ineffective Scottish backline from which he has done well to recover.