Mykhailo Mudryk made his first appearance for Chelsea in 615 days as Xabi Alonso’s side were beaten 1-0 by Juventus in a pre-season friendly in Hong Kong.Geovany Quenda was impressive on his debut for Chelsea, while there were also first appearances for Danny Welbeck, Mike Penders and Marco Palestra.Edon Zhegrova scored the game’s only goal for Juventus, whipping a strong finish beyond Penders, the goalkeeper who replaced Robert Sanchez at half-time.Chelsea’s next fixture is against Milan at the Gelora Bung Karno Stadium in Jakarta, Indonesia, on Saturday (1pm GMT).Simon Johnson analyses the talking points from Chelsea’s defeat at the Kai Tak Stadium…What did Chelsea fans learn about Quenda? Chelsea fans have had a long wait to see Geovany Quenda in action for the first time but it was worth the wait on this evidence.Quenda agreed to join Chelsea from Sporting CP for £40million ($53.9m) in March last year, but the agreement involved the winger staying at the Portuguese club until this summer.A minor injury picked up in a behind-closed-doors friendly against Bromley two weeks ago meant he did not join the club’s pre-season tour until Monday. That meant missing the first two competitive friendlies in Australia against Western Sydney Wanderers and Tottenham.You would have never known that he arrived in Hong Kong just two days earlier, though. The 19-year-old was Chelsea’s most dangerous player in the first half, causing Juventus a lot of problems on the right flank.(Darren Walsh/Chelsea FC via Getty Images)Quenda enjoyed dribbling with intent, often cutting onto his favoured left foot. One superb cross should have ended in a goal but fellow debutant Danny Welbeck headed wide.The Portugal Under-21 international certainly won over the Chelsea fans inside Kai Tak Stadium. They reserved their loudest cheers for when he got the ball.It is important he got off to an encouraging start because if he wants to play regularly on the right wing, he faces stiff competition from Estevao Willian.