Frank Lampard has warned Chelsea that Arsenal will be as tricky derby opponents ad ever at the Emirates on Boxing Day.

The fifth-placed Blues aim to inflict the lowly Gunners’ ninth defeat in 15 Premier League games.

But Lampard said: “When you play a derby, form does go out the window.

“‘Sometimes the idea of playing a derby is the spur the team needs to try and get a result.

“We have to expect the best Arsenal which is a really good footballing team with really good players, well-coached with rotations in their team and threats in attacking areas.”