Chelsea midfielder Ramires knows they face a test tomorrow at Manchester City.

Ramires, who spent last season in Portugal with Benfica, and is an international team-mate of former City men Robinho and Elano, believes they will be tough competition at the top of the table sooner or later.

"Obviously I have been following them, like the whole world, because of the strong investment they have been making, and they have a strong starting line-up, who all play international football," the 23-year-old told chelseafc.com. "All the players they have are good players, so they could become a big force.

"Manchester City will be a tough game because they are at home in front of their own fans, but at Chelsea we know we have the capacity to go there and win three points."