Manchester City manager Manuel Pellegrini has claimed that Sergio Aguero is as good as Lionel Messi and Cristiano Ronaldo after his five-goal display on Saturday, according to reports from the Mirror.Aguero put five goals in the space of just 20 minutes against Newcastle United during the weekend, ending in a 6-1 victory for the current league leaders.And Pellegrini has given the Argentina international the best possible compliment by comparing him to Ballon D’or favourites Messi and Ronaldo, however the former Malaga boss also revealed that City must win the Champions League in order for the world to recognize Aguero on the same level.WANT MORE? >> Manchester City Transfer News | Latest Transfer News“After what we have seen today, of course Kun [Aguero] is at that level,” said Pellegrini, as his Blues regained top spot in the Premier League. "I have already said that, after Ronaldo and Messi, he is the best player in the world.“But the important thing - not only for Kun but as a team - is that we must continue to improve. We need to win the Premier League again and to win the Champions League, because Messi and Ronaldo are always involved in that competition and that’s very important for a player.“I’m very happy for us that in Kun we have a very important player. He always makes important things [contributions] in competitions.“Remember, three years ago he decided the title in the last minutes of the season, and last season he was the top scorer in the Premier League. Every year he is improving, every day he becomes a better professional and he is more mature, so I think he will finish his career with some important achievements.”Aguero became only the fifth player in Premier League history to score five goals in a single game, with his tally now an amazing 115 goals in just 175 games for the Citizens.Last season, Aguero was also the league’s top scorer with 26 goals, but the 27-year-old has yet to win the PFA Player of the Year following five seasons at the Etihad. 

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