Two weeks after the last round of UEFA Champions League group matches, we have the second part of the mid-phase double-header. All four Bundesliga clubs emerged unbeaten in week three, and similar results this time around should see at least two of them through to the knockout stages with a couple of weeks to spare.
Borussia Dortmund are Germany's form team, while a stuttering FC Bayern München are just a win away from making the last 16 despite their poor domestic form. Schalke 04 are also struggling at home, but are unbeaten in Europe. The fourth German team, TSG 1899 Hoffenheim, still have some work to do if they are to make it past the group phase at their first attempt.
Borussia Dortmund v Atlético de Madrid (A)
With three wins from three and a goals record of eight scored and none conceded, Borussia Dortmund are one of the form teams in this year's group phase. Anything close to a repeat of their 4:0 hammering of three-time finalist Atlético de Madrid will see Lucien Favre's side through to the last 16, and almost certainly secure top spot with plenty to spare.
The two other teams in the group, AS Monaco and Club Brugge, have been more or less eliminated already.
Head to Head Record: P5 W3 D1 L1 F8 A3
FC Schalke 04 v Galatasaray S.K. (H)
In spite of their dreadful form in the Bundesliga, Schalke can consider themselves unlucky not to have won all three of their Champions League matches so far. Their one victory in Moscow against Lokomotiv, combined with draws against FC Porto and Galatasaray, has them two points behind the Portuguese side, but a point ahead of the Turkish champions.
Having dominated the match in Turkey to take a point, Domenico Tedesco's men will be banking on taking all three points, which will provide them with a perfect springboard into the knockout stages.
Head to Head Record: P3 W0 D2 L1 F3 A4
FC Bayern München v AEK Athens (H)
Despite being a shadow of their usual selves, FC Bayern are unbeaten, sharing top spot with Ajax Amsterdam. Week four sees the Bavarians entertain Green champions AEK Athens, and a rerun of their 2:0 win in Greece will take them onto ten points, while eliminating AEK, who are currently without a point.
Should Ajax beat Benfica in the other group fixture in Lisbon, it will secure safe passage for both themselves and Niko Kovač's side. It will then be a battle between the two old rivals over the last two match days for top spot in the group.
Head to Head Record: P1 W1 D0 L0 F2 A0
TSG 1899 Hoffenheim v Olympique Lyonnais (A)
Like Schalke, Hoffenheim could have been a far better position coming into this fourth week. Unlucky draws away to Shakhtar Donetsk and at home against Lyon, combined with a 1:2 home defeat by Manchester City, keeps Julian Nagelsmann's men in the mix - just about.
Having lost the lead twice and then forced a draw with a last-gasp equaliser, the men from Sinsheim know that only a win will do. Anything less, and they can starting thinking about having a shot at the Europa League.
Head to Head Record: P1 W0 D1 L0 F3 A3