Manchester United were placed in the same section as Real Sociedad in Friday's draw for this season's UEFA Europa League in Istanbul, while Arsenal will come up against PSV Eindhoven. United, who won the Europa League in 2017, will also meet Moldovan champions Sheriff Tiraspol and Omonia Nicosia of Cyprus in Group E.
Real Sociedad qualified for Europe by finishing sixth in La Liga last season -- they faced United in the Champions League group stage in 2013/14.
Arsenal's draw appears slightly tougher on paper, as they will also take on Norwegian champions Bodo/Glimt and Swiss title holders FC Zurich in Group A.
All three of the Gunners' rivals dropped out of the Champions League qualifying phase.
PSV, coached by Ruud van Nistelrooy, beat Monaco in the Champions League third qualifying round before losing to Rangers in the play-offs and moving into the Europa League.
Draw for the group stage of this season's UEFA Europa League, made in Istanbul on Friday:
Group A: Arsenal (ENG), PSV Eindhoven (NED), Bodo/Glimt (NOR), FC Zurich (SUI)
Group B: Dynamo Kyiv (UKR), Rennes (FRA), Fenerbahce (TUR), AEK Larnaca (CYP)
Group C: Roma (ITA), Ludogorets (BUL), Real Betis (ESP), HJK Helsinki (FIN)
Group D: SC Braga (POR), Malmo (SWE), Union Berlin (GER), Union Saint-Gilloise (BEL)
Group E: Manchester United (ENG), Real Sociedad (ESP), Sheriff Tiraspol (MDA), Omonia Nicosia (CYP)
Group F: Lazio (ITA), Feyenoord (NED), Midtjylland (DEN), Sturm Graz (AUT)
Group G: Olympiakos (GRE), Qarabag (AZE), Freiburg (GER), Nantes (FRA)
Group H: Red Star Belgrade (SRB), Monaco (FRA), Ferencvaros (HUN), Trabzonspor (TUR)
Match dates:
Matchday 1: September 8
Matchday 2: September 15
Matchday 3: October 6
Matchday 4: October 13
Matchday 5: October 27
Matchday 6: November 3
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