Arsenal defender Per Mertesacker says consistency will be key in next season's title race.

The German centre-half insists the Gunners, in Indonesia on their Asia tour, must start the season well to have a chance of winning a first Premier League since 2004.

He said: "Manchester City and United have been so successful because they are so consistent.

"If we can keep the consistency we showed at the end of last season, we should be challenging for trophies and titles."