On 8 August 2012, Ledley scored in Celtic's 2–0 away victory against HJK Helsinki in the second leg of the Champions League Third Qualifying Round. Ledley featured in both legs of Celtic's next qualifier against Helsingborg, which the club won 4–0 on aggregate to progress to the group stages of the Champions League. He then took part in 5 of these matches, including the club's first ever away win in the group stages – 3–2 vs Spartak Moscow – and the memorable 2–1 win over Barcelona at Parkhead. These results helped Celtic qualify for the last 16 round of the Champions League, albeit where they were comfortably beaten 5–0 on aggregate by Juventus, with Ledley only featuring in the second leg in Italy.