Manchester United will face a reunion with Cristiano Ronaldo after drawing Serie A champions Juventus in the Champions League group stage.
Ronaldo, who was at United between 2003 and 2009, joined Juve for £99.2m in July after nine years at Real Madrid.
Valencia and Young Boys are the other teams in Group H.
Tottenham have been drawn in a tough group to face Barcelona, while last season's runners-up Liverpool face Paris St-Germain and Napoli.
Eredivisie champions PSV Eindhoven and Inter Milan complete the line-up in Spurs' Group B and Red Star Belgrade are the other team to play Jurgen Klopp's side in Group C.
Premier League champions Manchester City were drawn in Group F alongside Shakhtar Donetsk, Lyon and Hoffenheim.
Last season's winners Real Madrid, who have won the competition for the past three years, are in Group G with Roma, CSKA Moscow and Viktoria Plzen.
Group stage draw in full:
Group A: Atletico Madrid, Borussia Dortmund, Monaco, Club Brugge.
Group B: Barcelona, Tottenham, PSV Eindhoven, Inter Milan.
Group C: Paris St-Germain, Napoli, Liverpool, Red Star Belgrade.
Group D: Lokomotiv Moscow, Porto, Schalke, Galatasaray.
Group E: Bayern Munich, Benfica, Ajax, AEK Athen.
Group F: Manchester City, Shakhtar Donetsk, Lyon, Hoffenheim.
Group G: Real Madrid, Roma, CSKA Moscow, Viktoria Plzen.
Group H: Juventus, Manchester United, Valencia, Young Boys.
When are the group stage match days?
Match day one: 18-19 September
Match day two: 2-3 October
Match day three: 23-24 October
Match day four: 6-7 November
Match day five: 27-28 November
Match day six: 11-12 December