Scottish Amateur champion Andrew McArthur has also accepted an invitation to play at Loch Lomond, and will challenge Barnes for the low amateur prize. McArthur, who plays at Windyhill Golf Club on the outskirts of Glasgow, won the 2002 Scottish Amateur Championship at Western Gailes.
After outscoring playing partner Tiger Woods by seven shots in the opening round, the 22-year-old American Barnes went on to finish the year's first major in 21st place.
The Barclays Scottish Open will be televised by The Golf Channel.
