The Englishman, who is ranked 41 in the world, failed to make it into the 12-man selection automatically and as a result he had to rely on a pick from captain Paul McGinley.
However, despite the fact that he has been chosen ahead of the likes of Luke Donald, the 41-year-old believes that he does have to prove himself at Gleneagles.
"It's nice to be here, I don't feel I have to justify my captain's pick. Paul has obviously picked me for a reason and I feel I can slot in to the team," he told reporters.
Westwood has appeared in eight previous Ryder Cups, having made his debut back in 1997.