Messi: Aguero one of the best in the world

Barcelona forward Lionel Messi has labelled Argentina team-mate Sergio Aguero as one of the world's best strikers, ahead of Tuesday's Champions League encounter at the Etihad.

Aguero was surprisingly dropped to the substitutes bench the last time these two sides met, with Luis Enrique's men running out 4-0 victors on the night.

However, with the European giants set to renew hostilities on Tuesday, Aguero is likely to start, having returned to the goal-scoring trail with a first-half brace in the 4-0 victory over West Brom at the weekend.

"Kun is a very simple and easy-going person, a great lad and, as a striker, one of the best. As is Luis [Suarez]," Messi told The Sun.

"They are different but, if you want to look at it like that, either of them can decide a game. They are both very decisive."

When asked to explain the differences between former Barca boss Pep Guardiola and the current incumbent, Enrique, Messi added: "In reality, the system of Barcelona is something that everyone knows.

"I can say we are one of the few clubs that have it, but each boss has different things and applies them as he sees fit.

"We have not noticed massive changes but, yes, some – in that with Luis maybe now we are a bit more aggressive when we attack at speed, whilst with Pep we used counter-attacks less."

Barcelona currently top Group C in the Champions League, having picked up maximum points from their opening three fixtures, while the Citizens are in second with four points to their name.