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 Athens. 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   (BBC Sport)