The Premier League is blessed to have witnessed one of the greatest managers in the world - Sir Alex Ferguson at Manchester United. He won the league thirteen times, which no manager has been able to come close to.Since the Scotsman retired, the Red Devils have struggled immensely. They have failed to win the league even once and at times failed to even book a place in the Champions League.Sir Alex Ferguson dominated the Premier LeagueWhile Manchester United haven't been that successful, the same hasn't been the case for their rivals. Manchester City and Liverpool have enjoyed their football and have done very well in the top division.Sir Alex Ferguson retired after the 2012-13 season. Since then, a lot of money has been spent in the transfer market by English clubs. Here, we take a look at the top net big-spenders in the Premier League.#6 Tottenham Hotspur £234.67 millionAntonio Conte is currently doing well at SpursSince Sir Alex retired, Tottenham Hotspur have improved comparatively. They finished second in the 2016-17 season and have finished third twice in the past nine seasons.In the process, they have spent £723.54 million in buying players, with Son Heung-min being the best of the lot. They have also sold players worth £488.87 million, out of which the sale of Gareth Bale played a massive contribution. Overall, Spurs have a net-spend of £234.67 and have failed to qualify for the Champions League on four occasions in the last nine years.#5 Liverpool £286.51 millionJurgen Klopp is bringing success back to LiverpoolManager Jurgen Klopp has changed the face of Liverpool ever since he joined the club in the 2015-16 season. With his attacking and direct approach, the Reds have looked pretty entertaining on the pitch.In the last nine years, Liverpool have gone on to win the Premier League once and are looking strong contenders this season. In the process, they have spent £855.06 million, with Mohamed Salah being one of their best signings.Anfield Watch@AnfieldWatch Jurgen Klopp on Liverpool being an attractive club for potential transfer targets:“To be honest I cannot remember that we struggled here to get players in we wanted. But that always can happen. I can’t remember when we struggled last time with talking to a player." 33218📺 Jurgen Klopp on Liverpool being an attractive club for potential transfer targets:“To be honest I cannot remember that we struggled here to get players in we wanted. But that always can happen. I can’t remember when we struggled last time with talking to a player." 🔴 https://t.co/Dk3QpUWgmDThey have let go of players worth £568.55 million which involves the sale of Philippe Coutinho to Barcelona. With a net-spend of £286.51 million, Liverpool have had quite the success post Sir Alex's retirement.#4 Chelsea £310.72 millionThomas Tuchel has done a great job at Chelsea so farIn the Roman Abramovich era, Chelsea were never shy of spending big when it came to getting the best players. In the last nine years, they have won the Premier League twice but have struggled to put up a strong fight lately.Frank Khalid@FrankKhalidUKIt’s shocking how much Eden Hazard transfer value has gone down since he left @ChelseaFC, mainly due to the injuries he has been getting.2576140It’s shocking how much Eden Hazard transfer value has gone down since he left @ChelseaFC, mainly due to the injuries he has been getting. https://t.co/V2m78fZlKYThat being said, they have spent £1.24 billion to bring players to Stamford Bridge. They have sold £928.45 million worth of players, which includes the sale of Eden Hazard to Real Madrid. With a net-spend of £310.72, they got a decent return for their money.#3 Arsenal £569.93 millionMikel Arteta is set to back Arsenal to the Champions LeagueArsenal last won the Premier League in the 2003-04 season. Since then, it has been a massive task for them and more so since the retirement of Arsene Wenger in 2018.The Gunners have missed out on a place in the Champions League since the 2016-17 season but are close to booking one at the end of the ongoing campaign. In the last nine years, they have spent £865.24 million and made £295.31 million from player sales. With a net-spend of £569.93 million, Arsenal should have been doing better.#2 Manchester United £854.4 millionJose Mourinho was expected to achieve big things at Manchester UnitedSir Alex Ferguson's retirement has been hard for Manchester United and their fans. The club has immensely struggled since the 2012-13 season despite having some of the finest managers at the helm.Sahil Bakshi@SBakshi13Ralf Rangnick might be the best thing that happened to Manchester United since Sir Alex Ferguson. But, only if the club bosses and those involved listen to him.Ralf #MUFCRalf Rangnick might be the best thing that happened to Manchester United since Sir Alex Ferguson. But, only if the club bosses and those involved listen to him.Ralf ♥️#MUFChttps://t.co/fLMvHH29iNUnited have been wrong on multiple fronts, including the types of players they have signed. They have spent £1.21 billion and made £363.47 million from the sale of their players. With a net-spend of £854.4 million, it is a pity that the Red Devils have not managed to have any success in the Premier League.#1 Manchester City (£881.44 million)Both Pep Guardiola and Sir Alex Ferguson are world-class managersThe fact that Sir Alex Ferguson would hate the most post his retirement would be the rise of Manchester City. Manchester United's arch-rivals have done exceptionally well in the last decade.Since Sir Alex's retirement, Manchester City have won the Premier League four times, out of which three have come under current manager Pep Guardiola. They are on course to win one more league title should they successfully keep Liverpool at bay at the end of the season.DR Sports@drsportsmediaIf the Jack Grealish deal is confirmed for £100m, Man City's total spend on transfers will be around £918m since Pep Guardiola arrived in 2016. That will go way over £1 billion if City also land Harry Kane... 38021If the Jack Grealish deal is confirmed for £100m, Man City's total spend on transfers will be around £918m since Pep Guardiola arrived in 2016. 💰That will go way over £1 billion if City also land Harry Kane... 😳Since the 2012-13 season, Manchester City have spend £1.36 billion on the purchase of players, with Kevin De Bruyne easily being one of their best signings. Their sales revenue saw them earn £481.32 million, which took their net spend to £881.44 million. Given City's dominance in the league over the past few years, there has been a worthy return on the investment made.