Chelsea is known for spending big in the transfer market, but the Blues also have a robust academy that has produced talented footballers in the past few years.Despite being associated with the expenditure of exorbitant amounts, Chelsea also boast one of the finest academies in world football. The London giants' youth teams won back-to-back UEFA Youth League titles in 2015 and 2016. They have also won the Premier League 2 competition twice. Meanwhile, their U18 side won five straight FA Youth Cups between 2013 and 2018.Chelsea FC@ChelseaFCChelsea Under-18s have won the quadruple this season! 🔥🏆 U18 Premier League Cup 🏆 U18 Premier League South 🏆 U18 Premier League 🏆 FA Youth Cup Incredible! 👏10:58 AM · May 7, 201883392702Chelsea Under-18s have won the quadruple this season! 🔥🏆 U18 Premier League Cup 🏆 U18 Premier League South 🏆 U18 Premier League 🏆 FA Youth Cup Incredible! 👏 https://t.co/7koS8p8WxgThanks to a combination of astute scouting, well-rounded development and deep pockets, Chelsea's future appears to be in secure hands. The average age of their 2021-22 squad is 26.7, which is younger than that of Manchester City and Liverpool, and level with Manchester United.Several Chelsea youngsters are already key members of the current squadFor most of 2010s, Chelsea faced heavy criticism for failing to give first team opportunities to talented players from their stacked youth teams. Their tendency to loan out most of their players also came under the scanner. The situation hasn't changed in that respect, as Chelsea sent out 37 players on loan in 2020-21.Such is the proficiency of their Cobham academy that the Premier League is littered with players who rose up the ranks at Chelsea. Declan Rice, Tariq Lamptey, Nathan Ake, Tino Livramento and Eddie Nketiah are just a few notable names at other clubs who originally came through at Cobham.Chelsea Youth@chelseayouthRegular reminder that Declan Rice is really good at football.2:39 AM · Jun 24, 2020106148Regular reminder that Declan Rice is really good at football.However, the London club have increasingly given first team opportunities to the cream of the crop from their academy. It also goes without saying that Chelsea still spend lavishly, although there has been an evident effort to bring in younger players. For instance, they spent a massive £272 million in the 2020 summer transfer window on the likes of Timo Werner, Kai Havertz and others.Here's a look at five talented stars who could go on to become a vital part of Chelsea's future:#5 Trevoh ChalobahChelsea's Trevoh Chalobah has already played Champions League football for the clubWhat a season 22-year-old Trevoh Chalobah is having. The centre-back has already played in 11 of Chelsea's 18 league games so far and has also faced Juventus in the Champions League. If that wasn't enough, he's scored in both competitions!Trevoh Chalobah@TrevohChalobahClean sheet and onto the semi’s.4:04 AM · Dec 23, 2021297771879Clean sheet and onto the semi’s. https://t.co/WYG6gZCGELThe lanky centre-back has caught everyone's eye with his pace and power. Used primarily against opponents that feature two strikers up front, Chalobah has clearly earned Thomas Tuchel's trust.Currently, the futures of first-choice defenders Thiago Silva, Antonio Rudiger and Andreas Christensen are all uncertain. Hence, the Englishman might even be able to nail down a starting spot sooner rather than later.#4 Kai HavertzKai Havertz (#29) in action for Chelsea against WatfordYes, we know Kai Havertz is having an abysmal start to the 2021-22 season. But at 22, the languid German has already scored the winning goal in a Champions League final and is a starter for his national team.Time is on Havertz's side and his ability is undeniable. Imperiously nonchalant when on song, it's true that the elegant playmaker is struggling to live up to his massive £71 million price tag. Signed from Bayer Leverkusen in 2020, Havertz has 13 goals and 12 assists in over 60 appearances for Chelsea.Kai Havertz@kaihavertz29We won the f***ing CHAMPIONS LEAGUE!! 🏆3:39 AM · May 30, 202115386929329We won the f***ing CHAMPIONS LEAGUE!! 🏆 https://t.co/ga2eWPUivwHis silky casualness often seems at odds with Tuchel's combative, tough-minded philosophy. But there is no doubt Chelsea have a supremely talented attacking player on their hands. The question is whether both parties can make it work.