Adrian Clarke looks at key tactical points in Matchweek 15.
Since the beginning of the season Arsenal have scored only five first-half goals.
Of the three players who have scored for Arsenal before half-time, Lacazette is the only one whose effort did not come from a set-piece or a penalty.
|Points if match ended at HT||9||19th|
Arsenal have gone into the break ahead only once this season, on the opening weekend at Fulham.
Another sluggish start on Boxing Day and they will be punished by Chelsea, who are strong finishers, scoring 20 second-half goals, the most in the division.
Arsenal must also sharpen up their finishing and improve their creativity.
They are ranked 16th for chances created and have spurned too many of the few opportunities they have mustered.
And their 14 big chances created are one more than Leicester City. But they have lacked the potency of those at the top.
|Club||Chances created||Goals||Conv. rate|
Arsenal's shot-conversion rate stands at a low 10.9 per cent, with all of the current top six exceeding 21 per cent.
Defender Gabriel, with 25 per cent, and Lacazette, with 21.4 per cent, are the only Arsenal players to match that ratio as individuals.
It is no coincidence the leading six sides all boast the strongest conversion rates in the Premier League.
With confidence low, Arteta has plenty to ponder ahead of Saturday's demanding test.
Arsenal may adopt a more back-to-basics approach and play with a higher intensity to try to unsettle Chelsea.
In this fixture last season Arsenal took the lead after 13 minutes.
Although Chelsea came back to win 2-1 in that match, Arteta will be hoping his side can make a similarly fast start again.
Tomorrow: Cancelo giving Man City an added dimension