Novak Djokovic says he has "high expectations" as he chases an elusive Olympic gold medal, with his confidence unshaken despite a poor year by his stellar standards.

The 24-time Grand Slam champion has not won a single title this season, losing in straight sets to Carlos Alcaraz in the Wimbledon final earlier this month. He returns to Roland Garros for a fifth Olympics, attempting to improve on the bronze he earned on his debut at the 2008 Beijing Games.