Kasimpasa pulled off a surprise 2-1 victory over Galatasaray at the Recep Tayyip Erdoğan stadium on Sunday.
The Lions took an early lead when Garry Rodrigues scored from range.
The home side equalized just before the half-time break and Koita went onto put his side ahead with 10 minutes left.
Chelsea lonaee Kenneth Omeruo started for Kasimpasa and put on another impressive display.
Omeruo made three tackles for the Istanbul minnows and the highest number of clearances in the entire game (14).
Kasımpaşa 2 – 1 Galatasaray
Stadium: Kasımpaşa Recep Tayyip Erdoğan
Referee: Halis Özkahya, Kemal Yılmaz, Cevdet Kömürcüoğlu
Kasımpaşa: Ramazan Köse, Veysel Sarı, Omeruo, Ben Youssef, Veigneau, Sadiku, Pavelka, Mensah (min. 80 İlhan Depe), Trezeguet (min. 90+4 Ahmed Ildız), Koita, Diagne (min. 71 Eduok)
Galatasaray: Muslera, Linnes, Serdar Aziz (min. 46 Eren Derdiyok), Maicon, Nagatomo, Donk, Tolga Ciğerci, Feghouli (min. 59 Sinan Gümüş), Selçuk İnan (min. 82 Yasin Öztekin), Rodrigues, Gomis
Goller: Dk. 37 Rodrigues (Galatasaray), Dk. 45+3 Diagne (Penaltıdan), Dk. 80 Koita (Kasımpaşa)
Sarı kartlar: Dk. 17 Nagatomo, Dk. 49 Tolga Ciğerci, Dk. 79 Rodrigues (Galatasaray), Dk. 36 Veigneau, Dk. 55 Sadiku, Dk. 90+1 İlhan Depe, 90+5 Koita (Kasımpaşa)