Sergio Aguero has warned his former side Manchester City not to get complacent as they set out to defend their Champions League semi-final lead over Real Madrid on Wednesday tonight, reports.

City go into the reverse fixture at the Santiago Bernabeu 4-3 ahead, but Aguero believes Madrid’s successful comebacks against both Paris Saint-Germain and Chelsea earlier in the competition should serve as a warning to Pep Guardiola’s men.

“Pep Guardiola should be happy with his team in the first match against Real Madrid because they played some amazing football and scored some really good goals, if the team is playing well and scoring you need to make sure you’re in control of the game and then you have a good chance of winning,” said global representative Aguero.

“Three goals for Real Madrid is not perfect for Manchester City, but they are ahead and away goals do not change things anymore.

“Real Madrid have already beaten PSG and Chelsea to get here in the Champions League, and they are two of the best teams – the Champions League winner from last year and the best team in France with Lionel Messi and so many stars.

“City know this and have to have 100 per cent focus on the match and not think they have won until the final whistle because Real Madrid fight until the end, they will want to win and City can’t think the job is done.”

City dominated large parts of the first leg yet came away with only a one-goal lead, a factor which Aguero does not think will deter Guardiola’s chocie of tactics.

“I don’t think Manchester City will play in a different way to normal for the match in Madrid.

“This team is so good because there is a lot of talented players and a lot of them have played for Guardiola for a long time and know exactly what they need to do – there is only one way of playing and everybody understands that.

“Maybe the formation or people on the pitch change but they all work towards the same goal of winning and making it a hard game for Real Madrid.”