 On 13 July 2015, Chelsea signed Begović on a four-year deal for a fee of £8 million.As part of the deal Chelsea also offered midfielder Marco van Ginkel in part exchange to Stoke on loan for one season.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 2–4 defeat.