He made his debut nine days later on Chelsea's pre-season tour, coming on at half time for Thibaut Courtois with Chelsea 1–0 up against the New York Red Bulls, but the match ended in a 4-2 defeat. His first competitive fixture was the 2015 FA Community Shield on 2 August at Wembley Stadium, in which he was unused in a 1–0 loss to rivals Arsenal. Six days later he came on as a substitute for Oscar when Courtois was sent off for conceding a penalty with a foul on Bafétimbi Gomis, who converted it for a 2–2 draw. On 16 August, Begović made his first competitive start for Chelsea in a 3–0 away loss to Manchester City. A month later, he earned the first clean sheet of the season for Chelsea in a UEFA Champions League match against Maccabi Tel Aviv which ended in a 4–0 win for Chelsea. He kept a sequence of three clean sheets before Courtois returned to the team on 5 December.