Dedryck Boyata has conceded that Manchester City have a fight on their hands in order to defend the Premier League title this season.
Arsenal, Chelsea, Liverpool and Manchester United have welcomed over £250m worth of talent between them to their respective clubs this summer.
Speaking to Sky Sports News, Boyata admits that retaining their title represents a "really difficult" task as a result of their rivals' spending sprees.
"We know this year is going to be really difficult because a team like Arsenal has done everything in the transfer market to get the best players they can," he said.
"They have bought some good players and I think this year will be tough with Arsenal, Chelsea, United. It will be tough."
Manuel Pellegrini's side kick off the new league season with a visit to Newcastle United on Sunday.