Barcelona defender Javier Mascherano has singled out Sergio Aguero as Manchester City's main dangerman ahead of their Champions League encounter on Wednesday.

Aguero missed a penalty in his side's 1-1 draw with Everton at the weekend, but has already scored 11 goals in nine appearances in all competitions for City this term.

Six of those have come in the Champions League and Mascherano has warned his team-mates about the danger his international colleague poses.

"Aguero is one of the best players in the world inside the box due to his finishing and his all-round quality," the Argentine told the official Barcelona website.

"It will be a great game as Manchester City have improved a lot this season."

Wednesday's game at Camp Nou will see Mascherano reunited with Pep Guardiola and the Argentine has nothing but praise for his former coach.

"Guardiola has had a massive impact on my life," Mascherano added.

"Firstly, because he brought me to this club, and secondly, because he taught me so much during the two years we were together. 

"Guardiola is so influential because of his impressive reading of the game."