Last year's Champions League runners-up Borussia Dortmund's trip to London to face Arsenal is the marquee match-up on Tuesday's schedule in Europe. Dortmund recovered from their opening day loss against Napoli with a defeat of Marseille and will be looking to keep the Gunners from opening up an even bigger advantage at the top of their group.
Chelsea head to Germany looking to keep Schalke 04 from pulling away from them in Group E. Atlético Madrid can take control of their group with a win over Austria Vienna while AC Milan and Barcelona meet again with the Italians looking to get some measure of revenge after last season's Round of 16 defeat to the Blaugrana. Milan have struggled so far in Serie A, but did win this weekend. They'll be hoping to catch Barcelona looking ahead to this weekend's Clasico.
Schedule (All matches kick-of at 2:45 p.m. ET)
Schalke 04 vs. Chelsea
Steaua Bucuresti vs. FC Basel
Arsenal vs. Borussia Dortmund
Marseille vs. Napoli
Austria Vienna vs. Atletico Madrid
FC Porto vs. Zenit St Petersburg
AC Milan vs. Barcelona
Celtic vs. Ajax Amsterdam