It was Galatasaray’s second win in the group stage following the Yellow and Reds’ away victory over French club Lille in their previous game.
Osimhen was in action for the entire duration of the matchday four encounter.
The 27-year-old has netted once in three appearances for the Turkish Super Lig champions in the Champions League this season.
Aleksey Batrakov scored both goals for the hosts in the game.
Batrakov netted the opener in the 12th minute, and doubled the advantage three minutes later.
