Pep Guardiola's winning start as Manchester City boss came to an end as his side battled for an absorbing 3-3 draw at Celtic in the Champions League.
Sanchez set up Walcott for both goals on Wednesday as the Gunners beat Basel 2-0 in the Champions League.
Napoli coach Maurizio Sarri is hoping to hear the Champions League anthem at the Stadio San Paolo many more times after enjoying his first taste.
Arsenal's Theo Walcott says his goal-scoring form is down to working harder than he's ever done before.
Tottenham's Harry Winks believes he is perfectly suited to Mauricio Pochettino's style, and says his breakthrough week has left him hungry for more.
Paco Alcacer's difficult start to life at Barcelona continued on Wednesday night and coach Luis Enrique needs to make sure he uses him properly.