Thomas Tuchel has been nothing short of a revelation since arriving at Chelsea just over a year ago. The German tactician was appointed head coach of the London giants in January 2021, with the Blues languishing in ninth place in the Premier League table at the time.Tuchel led the club to a fourth-place finish as well as a sensational 2021 UEFA Champions League triumph, the second in the club's history. Since then, Chelsea have also won the 2021 UEFA Super Cup and the 2022 FIFA Club World Cup under the German's guidance.They narrowly lost this year's EFL Carabao Cup final to Liverpool after a penalty shootout. But they are safely into the FA Cup semi-finals, as well as the 2022 Champions League quarter-finals.Chelsea FC@ChelseaFCCHAMPIONS OF EUROPE!!! #ChelseaChampions #UCLFinal2:30 AM · May 30, 202122795287754CHAMPIONS OF EUROPE!!! 🏆 #ChelseaChampions #UCLFinal https://t.co/Wz000kegmGChelsea's defenders have flourished under Thomas TuchelTuchel's time at Stamford Bridge has been characterized by defensive resilience and solidity. While Chelsea's attack has been blunt and wasteful at times under the German, their defense has been impenetrable. The Blues finished the 2020-21 season with the second-best defensive record in the league (36 goals conceded).Pys@CFCPysTuchel’s Chelsea UCL KO Record : Atletico 0-1 ChelseaChelsea 2-0 Atletico Porto 0-2 ChelseaChelsea 0-1 PortoReal Madrid 1-1 ChelseaChelsea 2-0 Real MadridChelsea 1-0 Man CityChelsea 2-0 Lille11 goals scored, 2 conceded.4:11 AM · Feb 23, 20224446472Tuchel’s Chelsea UCL KO Record : Atletico 0-1 ChelseaChelsea 2-0 Atletico Porto 0-2 ChelseaChelsea 0-1 PortoReal Madrid 1-1 ChelseaChelsea 2-0 Real MadridChelsea 1-0 Man CityChelsea 2-0 Lille11 goals scored, 2 conceded. https://t.co/vmCtZwtOW6With 19 goals conceded in 28 games so far this season, the third-placed side have let in just one more than the league's meanest defence Manchester City. The Sky Blues are on course to have English football's stingiest defense for the second year running.Therefore, it is no surprise that defenders dominate our list of five Chelsea stars who have flourished under Thomas Tuchel.#5 Mateo KovacicMateo Kovacic gets his team up the pitch with a darting runNot the most glamorous of players, Croatian star Mateo Kovacic has formed a tremendous partnership with N'Golo Kante in the middle of the park for Chelsea. The 27-year-old midfielder is in his fourth season at Stamford Bridge and has made 175 appearances (four goals, 12 assists) since arriving from Real Madrid.Absolute Chelsea@AbsoluteChelseaThomas Tuchel on Mateo Kovacic: “He has the mentality of a real champion.”[via @ChelseaFC]8:21 AM · Feb 11, 20213699129Thomas Tuchel on Mateo Kovacic: “He has the mentality of a real champion.”[via @ChelseaFC]Kovacic has featured in 53 of Tuchel's 78 games as Blues boss so far, scoring twice and providing five assists. Like his compatriot Luka Modric, Kovacic is a well-rounded midfielder, capable of winning the ball back and playing a pass.His most valuable trait, however, is his ability to move forward with the ball at his feet, as Kovacic's penetrative dribbles help the Blues get up the pitch quickly.#4 Edouard MendyEdouard Mendy has been huge for the Blues since his arrival at the clubSigned from Stade Rennais for £21.5 million in 2020, 30-year-old Edouard Mendy has enjoyed a rapid rise under Thomas Tuchel. After spending £72 million on Kepa Arrizabalaga, who turned out to be a huge disappointment, the Blues were under pressure to acquire a world-class keeper.Chelsea FC@ChelseaFCThe best in the world! Edouard Mendy is #TheBest FIFA Men's Goalkeeper! 11:54 AM · Jan 17, 20229321716180The best in the world! ⭐Edouard Mendy is #TheBest FIFA Men's Goalkeeper! 👏 https://t.co/izkH6S8FVvThe Senegalese custodian has developed into an elite keeper during his time at Chelsea. Mendy has played 58 games under Tuchel, keeping 32 clean sheets and conceding just 34 goals.He was named the best goalkeeper in the world for 2021 at FIFA's 'The Best' awards earlier this year.#3 Kai HavertzKai Havertz celebrates his late winner against Newcastle United in a league fixtureGerman attacking midfielder Kai Havertz endured a difficult start to life at Stamford Bridge after joining the club in 2020 from Bayer Leverkusen for £72 million. The 22-year-old, though, continues to shine under Tuchel and is a bright spot in an otherwise underwhelming Chelsea attack.SuperSport 🏆@SuperSportTVKai Havertz 🥶🥶A 𝙬𝙤𝙧𝙡𝙙 𝙘𝙡𝙖𝙨𝙨 finish from the German in the 90th minute to hand Chelsea a 1-0 win over Newcastle.9:26 AM · Mar 13, 202244851156Kai Havertz 🥶🥶A 𝙬𝙤𝙧𝙡𝙙 𝙘𝙡𝙖𝙨𝙨 finish from the German in the 90th minute to hand Chelsea a 1-0 win over Newcastle. https://t.co/MijpTBSGGFHavertz has played 55 games under his compatriot, scoring 15 goals and providing eight assists. With 11 goals across competitions so far this season, he is the club's second-highest scorer, just one behind Romelu Lukaku. The German star famously scored the only goal of the 2021 Champions League final, handing his club a 1-0 win over Manchester City.#2 Reece JamesReece James celebrates against BurnleyThe importance of wing-backs in Thomas Tuchel's system is well-documented. It is no surprise that Ben Chilwell and Reece James have flourished under the German manager.James, in particular, has enjoyed a meteoric rise over the last year, going from a talented academy product to one of the best wing-backs in the Premier League.The 22-year-old Englishman has caught the eye with his crossing ability, pace and power. With six goals and eight assists in 55 games under Tuchel, James has been remarkably productive in attacking areas.Squawka@SquawkaReece James has been directly involved in more goals this season than any other Chelsea player:◎ 16 games◉ 5 goals◉ 5 assistsHappy 22nd birthday. 🥳7:09 AM · Dec 8, 20212269213Reece James has been directly involved in more goals this season than any other Chelsea player:◎ 16 games◉ 5 goals◉ 5 assistsHappy 22nd birthday. 🥳 https://t.co/f2IKcLN8vsHis power, stamina and recovery speed make him a solid defender as well. It would not be a surprise to see the young star continue to get better in the coming months.#1 Antonio RudigerAntonio Rudiger during the 2022 FIFA Club World CupDuring Frank Lampard's last months as Chelsea boss, it seemed as though Antonio Rudiger's departure from Stamford Bridge was inevitable. The 29-year-old German centre-back made just four league appearances in the first half of the 2020-21 season before Tuchel's arrival sparked a dramatic turnaround.Since then, Rudiger has been transformed into one of the most in-demand defenders in the world. He is arguably the most important Blues player under Tuchel, featuring in 66 games so far.Rudiger's brutal aggression, raw pace, and imposing physique make him a tough customer to handle at both ends of the pitch.TweetChelseaUK@TweetChelseaUKAntonio Rudiger is the best centre-back in the Premier League, above Ruben Dias and Virgil van Dijk says Rio Ferdinand. #cfc10:26 AM · Sep 21, 202126620Antonio Rudiger is the best centre-back in the Premier League, above Ruben Dias and Virgil van Dijk says Rio Ferdinand. #cfc https://t.co/51ZSbeEEyVA real threat from set-pieces, he has four goals and five assists to his name under Tuchel, while also being one of the most solid centre-backs in Europe. He is out of contract this summer and it would not be a surprise to see the continent's elite clubs make massive wage offers to secure his services.