In 2005–06, Eboué made his breakthrough into the Arsenal side. He started the season mainly as a reserve player, though he scored his first goal for Arsenal in the club's 3–0 League Cup third round victory at Sunderland on 25 October 2005. Despite leaving for the African Cup of Nations in January 2006, he was immediately sent into action on his return; he made his first career Premiership start at right back against Liverpool at Anfield, replacing the injured Lauren. With Lauren injured for the rest of the season, Eboué unexpectedly held his place for the remainder of Arsenal's 2005–06 campaign.