Arsenal will play their fourth Europa League match this week, but it's not the usual Thursday night.
The Gunners will take to the pitch on a Wednesday, which is traditionally a Champions League night.
Portugal's top three teams; Braga, Porto, and Vitoria are all playing European football, which is the main reason complicating the schedules of their home matches.
The Portugues police authorities do not allow for teams from the Porto region to play on the same day for security reasons and, as a result, when Porto plays at home, Braga must play away and vice-versa.
For the above reason, Vitoria have planned all their home matches to be played on Wednesdays to avoid fans clashing.
The matches will also kick off early, to avoid any clash with the Champions League matches, with Arsenal's kicking off at 3.50PM GMT (6.50 pm EAT).
Arsenal narrowly beat the Portugues side 3-2 last time in the competition, with a double from Nicolas Pepe giving them a 100% to their campaign.
Arsenal's remaining Europa League matches;
- 6 November: Vitoria SC vs Arsenal
- 28 November: Arsenal vs Eintracht Frankfurt
- 12 December: Standard Liege vs Arsenal