 Complete the following phrase:  Čech started the season as the first choice in goal for new manager Unai Emery, but later lost his place to new signing Bernd Leno after suffering a hamstring injury during a match against Watford. On 15 January 2019, Čech announced via open letter on Twitter that he would retire at the end of the season. On 29 May, he made the final appearance of his career in Arsenals 41 defeat to his former club Chelsea in the 