Sergio Aguero has signed a contract extension with Manchester City. This means that he will be a player of the club all the way until 2021. The Argentine joined the club back in 2011 and with this extension, the striker would be spending a decade of his life with the Citizens.Aguero has played a role in many of the successes of the club, including their most recent Premier League title victory back in May. In the first five opening games, he has started in every single match and scored three goals while providing two assists. For the upcoming fixture against Cardiff City, the 30-year-old could make his 300th appearance for the club across all competitions. Now into his seventh year at the club, Aguero has already scored more than 200 goals and he has become Manchester City's all-time top goalscorer back in 2017.Every fan knows his talent in the Premier League and all the clubs are wary whenever he plays. According to WhoScored, the forward is very strong in his key passes, finishing and passing. This has made him an excellent and integral player for Pep Guardiola who has managed to develop him even further.Many people see this piece of news as a huge boost to the team who is still heavily reliant on him for goals. The Citizens currently sit third in the Premier League standings, two points behind both Chelsea and Liverpool. In terms of the number of goals scored, Manchester City and the Reds are on par with each other having scored 14 goals in 5 games. Beyond that, fans are already seeing him as a legend.It is still early in the new season, but Aguero could be on course to winning the Premier League Golden Boot as both Mohamed Salah and Harry Kane have been looking out of sorts in recent games. Here is a look at how fans celebrated his contract extension.Sergio Aguero extends his stay with Man City until 2021. He's averaged a goal every 108 minutes as a City player... 🔵😮🏃‍♂️ 299 Games⚽️ 204 Goals🅰️ 60 Assists🏆 3 PL Titles🏆 3 League Cups pic.twitter.com/eTe5jOy4Lu— TheFootballRepublic (@TheFootballRep) September 21, 2018Record goalscorer⚽Three Premier League titles🏆300th appearance this weekend🏅Contract extension✅Sergio Aguero, Man City's talisman💙👉 https://t.co/pi4NvLzPR4 #MCFC pic.twitter.com/y1pMQgTzjB— BBC Sport (@BBCSport) September 21, 2018Aguero needs to score 63 goals to become all time 2nd top scorer in PL history. I'm sure he'll do it. 👑 pic.twitter.com/9xMzWIr90E— вѕ (@Sergio10i) September 21, 2018204 - Sergio Aguero is Manchester City's all-time leading goalscorer with 204 goals; 27 more than any other player for the club. Legend. pic.twitter.com/BIHd8QrewE— OptaJoe (@OptaJoe) September 21, 2018Aguero signed a one year contract extension which will keep him at City till 2021. 2021 will be his 10th year at City. That’s the main reason he signed he said. After that he will return to Independiente.— Aysha Ridzuan (@ayshardzn) September 21, 201836 - Since the start of his first season at Manchester City, Sergio Aguero has scored 36 more goals than any other player in the @premierleague (146 goals); with Harry Kane (110) scoring the next most. Exceptional. pic.twitter.com/UPIoMcF8vz— OptaJoe (@OptaJoe) September 21, 2018Sergio Aguero needs 30 more goals to overtake Thierry Henry & become the highest scoring foreign player in Premier League history...He now has until 2021 to do it! 👀 https://t.co/cobWQvVCpN— Footy Accumulators (@FootyAccums) September 21, 2018Hey do I get the feeling that in the May 2020, Sergio Aguero is going to win the UCL for Man City with his last kick for the football club in a penalty shootout in Istanbul.Probs will somehow be against Liverpool or some shite Turkish team.— Som Schneebly 🏴󠁧󠁢󠁥󠁮󠁧󠁿🦁🐂💛💙 (@ChrisSom427) September 21, 2018Aguero will make his 300th City appearance tomorrow. Let’s hope he makes it one to remember— BlueMancunian (@BlueJordan2001) September 21, 201810 years of David Silva and Aguero. BOIIIIIIIIIIIIIIIIIIIIII.— Jeep (@T1mmyg) September 21, 2018Sergio Aguero could make his 300th appearance tomorrow for Man City. If he does and he scores you know that’s MOTM guaranteed pic.twitter.com/zl6vZWuKqS— Dan Cox (@dancox82) September 21, 2018I`ve never been a Man City fan but they will have to start saving their money now to get a player as good as Sergio Aguero in 2021...he has been an absolute gem for them. Tony— toneeone (@TonyBrownson1) September 21, 2018Needed that Aguero news after that catastrophe on Wednesday.— A. Amos (@fabamos_) September 21, 2018Aguero and David Silva joint testimonial at the Etihad? pic.twitter.com/beDAGcs5UH— Lewis Steele (@LewisSteele_) September 21, 2018I was not expecting to wake up to an Aguero contract extension, amazing news— Alex (@mcfc_aIex) September 21, 2018A lot of respect for Aguero! Players like him and Silva - who've played for years at City at a highly consistent level and never flirted with other clubs. RATED! https://t.co/M7Q35L2lwJ— Aman Matharu✌️ (@aman_matharu) September 21, 2018