Dastan Satpayev marked his unofficial Chelsea debut with a powerful strike just six minutes into a ten-goal pre-season friendly.The Blues came from behind on three occasions to beat Western Sydney Wanderers 6-4 on Tuesday in their summer schedule opener.Satpayev made a dream start to life at Chelsea, but is not officially their player just yetGettyJoao Pedro, who has been resting amid his shock World Cup omission with Brazil, came off the bench to score a hat-trick in Sydney.His fellow striker Satpayev also made a good impression on manager Xabi Alonso, even though he isn’t technically a Chelsea player just yet.Satpayev starts and scores in sixIt was announced in February 2025 that the Kazakh starlet would join Chelsea this summer from FC Kairat for a reported €4million (£3.4m).FIFA rules state that clubs can only complete international transfers if the player is aged 18 or above.Chelsea and Kairat reached an agreement for Satpayev when he was 16-years-old, meaning he couldn’t complete an immediate move.However, with his 18th birthday approaching, he has been able to join his new club for pre-season as a trialist.As per Peter Rutzler of The Times, Chelsea received permission from Kairat and the player’s family to include him in their squad.Satpayev was named in Alonso’s starting XI to face Wanderers and managed to score the opening goal in style.Academy star Ryan Kavuma-McQueen fed an excellent ball into the 17-year-old, who then blasted into the back of the net.He played 63 minutes of the match before Alonso substituted him for Jamie Gittens.Pedro came off the bench and scored a hat-trick in the wild winGettySatpayev has scored 26 goals in 58 matches for Kairat and netted in their debut Champions League campaign last season.The teenager has also earned eight caps for Kazakhstan, for whom he made his debut aged just 16 in March 2025.Chelsea up and running under AlonsoMinutes after Satpayev scored, Wanderers levelled via Anthony Pantazopoulos and then took the lead thansk to Aydan Hammond.Dario Essugo made it 2-2 before the break, but Dylan Scicluna put the hosts back in front shortly after the hour mark.Wanderers led yet again through Awan Lual after Gittens netted for Chelsea, who then wrapped it up with a stunning Pedro performance.Although they conceded four goals, the Blues made a winning start to life under Alonso.Alonso has got his first taste of victory in the Chelsea hotseatGettySatpayev and Marco Palestra were the only new signings to feature for the west Londoners amid a swathe of young talent.Chelsea return to action on Saturday when they face Premier League rivals Tottenham Hotspur in their second friendly.