The fourth round of matches holds great significance for several teams in this year's competition as defending champions Chelsea face a crunch encounter against runaway Ukrainian league leaders Shakhtar Donetsk, with beaten finalists Bayern Munich vying to keep pace in Group F when they host Lille.

United recovered from an early two-goal deficit to beat Braga 3-2 at Old Trafford a fortnight ago to record their third win in as many matches in Europe's top club competition, having yet to reach top gear.