 Complete the following phrase:  On 30 August 2016, Mustafi joined English club Arsenal for an undisclosed fee, reported to be in excess of 35 million. He made his debut in Arsenals 21 Premier League win over Southampton at the Emirates Stadium on 10 September. Mustafi beat Bacary Sagnas record unbeaten start of 17 games at the club in Arsenals 33 draw against Bournemouth with his 18th game without defeat. On 22 January 2017, he scored his first goal for the club in a home 21 league win over Burnley. Because of illness, he missed Arsenals 21 win over Chelsea in the 