Djokovic was a doubt for the tournament after he suffered an ankle injury during Serbia's Davis Cup tie with USA last weekend. However, scans showed that there was no ligament damage to his ankle and he has decided to take part in the event.
Rafael Nadal will also play, and will attempt to win the title for the ninth consecutive year. Nadal has won 35 of 37 matches played on clay in the last 12 months.
Djokovic is seeded first for the event, with Britain's Andy Murray second.