Elye Wahi put in an excellent performance as Lens came from behind to shock Arsenal 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.
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Squad number30Player nameSamba
Squad number24Player nameGradit
Squad number4Player nameDanso
Squad number14Player nameMedina
Squad number29Player nameFrankowski
Squad number26Player nameMendy
Squad number6Player nameAbdul Samed
Squad number3Player nameMachado
Squad number7Player nameSotoca
Squad number28Player nameThomasson
Squad number9Player nameWahi
Squad number2Player nameAguilar
Squad number11Player nameFulgini
Squad number18Player nameDiouf
Squad number22Player nameSaïd
Squad number22Player nameRaya
Squad number18Player nameTomiyasu
Squad number2Player nameSaliba
Squad number6Player nameGabriel Magalhães
Squad number35Player nameZinchenko
Squad number8Player nameØdegaard
Squad number41Player nameRice
Squad number29Player nameHavertz
Squad number7Player nameSaka
Squad number9Player nameGabriel Jesus
Squad number19Player nameTrossard
Squad number4Player nameWhite
Squad number10Player nameSmith Rowe
Squad number14Player nameNketiah
Squad number21Player nameFábio Vieira
Squad number24Player nameNelson
Formation 3-4-2-130Samba24Gradit4Danso14Medina29Frankowski26MendySubstituted forDioufat 73'minutes6Abdul SamedBooked at 90mins3MachadoSubstituted forAguilarat 81'minutes7Sotoca28ThomassonSubstituted forFulginiat 73'minutes9WahiSubstituted forSaïdat 73'minutes
Formation 4-3-322Raya18Tomiyasu2Saliba6Gabriel35ZinchenkoSubstituted forWhiteat 71'minutes8ØdegaardSubstituted forNketiahat 80'minutes41Rice29HavertzSubstituted forSmith Roweat 70'minutes7SakaSubstituted forFábio Vieiraat 34'minutes9Gabriel JesusBooked at 90mins19TrossardSubstituted forNelsonat 70'minutes
Substitutes1Ramsdale4White5Partey10Smith Rowe14Nketiah15Kiwior17Cédric Soares20Jorginho21Fábio Vieira24Nelson25Elneny31Hein
Match ends, Lens 2, Arsenal 1.
Second Half ends, Lens 2, Arsenal 1.
Attempt blocked. Gabriel Magalhães (Arsenal) header from the centre of the box is blocked. Assisted by Reiss Nelson with a cross.
Corner, Arsenal. Conceded by Florian Sotoca.
Attempt blocked. Emile Smith Rowe (Arsenal) right footed shot from the centre of the box is blocked. Assisted by Takehiro Tomiyasu with a headed pass.
Corner, Arsenal. Conceded by Przemyslaw Frankowski.
Takehiro Tomiyasu (Arsenal) wins a free kick in the attacking half.
Foul by Florian Sotoca (Lens).
Gabriel Jesus (Arsenal) is shown the yellow card.
Salis Abdul Samed (Lens) is shown the yellow card.
Foul by Fábio Vieira (Arsenal).
Brice Samba (Lens) wins a free kick in the defensive half.
Attempt missed. Gabriel Jesus (Arsenal) header from the left side of the six yard box misses to the right.
Attempt blocked. Reiss Nelson (Arsenal) right footed shot from the centre of the box is blocked.
Attempt missed. Florian Sotoca (Lens) left footed shot from the centre of the box misses to the left. Assisted by Angelo Fulgini with a cross.
Foul by Gabriel Jesus (Arsenal).
Jonathan Gradit (Lens) wins a free kick on the right wing.
Attempt saved. Emile Smith Rowe (Arsenal) right footed shot from outside the box is saved in the top right corner.
Emile Smith Rowe (Arsenal) wins a free kick in the defensive half.
Foul by Andy Diouf (Lens).