 Complete the following phrase:  On 1 July, Kovačić completed a permanent transfer to Chelsea, signing a five-year contract. After an underwhelming season under Maurizio Sarri, he turned into one of the most important Chelsea players under new coach Frank Lampard. Kovačić scored his first goal for Chelsea on 27 November, in a 22 Champions League draw against Valencia at Mestalla Stadium. On 7 December, he scored his first Premier League goal in a 13 away loss to Everton. In the 