The Argentine has been a revelation for City since joining from Atletico Madrid in a deal believed to be worth £38m in the summer of 2011. He has scored 73 goals in 113 appearances for the Blues, claiming the Premier League, Community Shield and League Cup over the course of the last three years. The 25-year-old has bagged 26 of his goals for the club in just 25 outings this term, despite having been sidelined on numerous occasions by injury. And, while that form has led to the player being linked with both Barcelona and Real Madrid, Pellegrini is refusing to entertain the idea. "I don't think the idea of Sergio is to leave Manchester City," he said. "Sergio is very happy here. You never know what can happen in the future, but he is a very important player here. "Big clubs do not sell their best players and I don't think Sergio will be going anywhere."