Ah You's second season with Connacht saw him play more regularly, and he made his first league start for Connacht in the opening game of 2011–12 Pro12, the Celtic League having been renamed. In that game against Benetton Treviso, Ah You scored his first try for the province and it proved decisive as Connacht won by just two points. Over the course of the season he featured in 13 games, seven of them being starts. The season also saw Ah You play in four of Connacht's six games in their first ever Heineken Cup campaign, starting against Harlequins and Toulouse, and coming from the bench in both games against Gloucester.