2003–04 was an even better season for Gilberto, as he was instrumental in helping Arsenal win the Premier League title whilst going the entire season unbeaten. He played in 32 of Arsenal's 38 unbeaten Premier League games during the season. His next season started equally impressively, as he scored the first goal in Arsenal's 3–1 Community Shield win over Manchester United at the Millennium Stadium. During the opening games of the season, he started to experience severe pain in his back, and after a match at Bolton Wanderers on 27 September 2004, a scan revealed he had fractured his back. At first it was reported that he would be out of action for a month. Later reports suggested the injury could be season-threatening.