Arsenal are favourites to qualify for the last 16 of the Champions League. So what do they need against Napoli on Wednesday?

Put simply...

1. If Borussia Dortmund fail to beat Marseille, Arsenal will qualify

2. If Borussia Dortmund beat Marseille, Arsenal must avoid a three-goal defeat against Napoli to qualify

3. Arsenal will finish top of Group F if they avoid defeat against Napoli. They will also finish top if they avoid a three-goal defeat and Borussia Dortmund fail to beat Marseille.

Want to know more? Read on for the full explanation from Uefa...

According to Uefa's rules, if three teams end the group on the same number of points, the following 'tiebreakers' will be used (in order) to decide who progresses to the knockout stages:

(a) highest number of points obtained in the group matches played among the teams in question (Arsenal, Napoli and Dortmund)

(b) superior goal difference from the group matches played among the teams in question (ie. Arsenal, Napoli and Dortmund)

(c) higher number of goals scored in the group matches played among the teams in question (ie. Arsenal, Napoli and Dortmund)

(d) higher number of goals scored away from home in the group matches played among the teams in question (ie. Arsenal, Napoli and Dortmund)

If, after applying criteria (a) to (d) to all three teams, two teams still have an equal ranking, criteria (a) to (b) are reapplied exclusively to the matches between the two teams in question to determine their final rankings.

If this procedure does not lead to a decision, criteria (e) to (g) apply;

(e) superior goal difference from all group matches played;

(f) higher number of goals scored from all group matches played;

(g) higher number of coefficient points accumulated by the club in question, as well as its association, over the previous five seasons.