Elye Wahi put in an excellent performance as Lens came from behind to shock Arsenal 2-1 in the Champions League.
Wahi's first-time finish into the bottom left corner after a cross from Przemyslaw Frankowski saw the home side take the lead in the 69th minute.
The Gunners rode some early pressure from Lens before Gabriel Jesus opened the scoring after a 14th-minute through-ball from Bukayo Saka, who then went off injured.
Lens levelled with a superb finish from Adrien Thomasson, who curled into the far corner.
Saka went off after 33 minutes in another blow for Mikel Arteta's side on a difficult night in Europe's top-tier competition.
Man United 2-3 Galatasaray
Lens 2-1 Arsenal
Napoli 2-3 Real Madrid
Union Berlin 2-3 Sporting Braga
RB Salzburg 0-2 Real Sociedad
FC Copenhagan 1-2 Bayern Munich
PSV 2-2 Sevilla
Inter 1-0 Benfica