The 26-year-old Dutch forward cut his thumb on an advertising hoarding in the 76th minute, crashing to the ground in pain while clutching his injured hand.
He was consoled by Alisson Becker and Virgil van Dijk as medical staff rushed in. After receiving oxygen, he was stretchered off the pitch.
Eray Yazga, Galatasaray’s general secretary, confirmed the legal intent following the emergency, stating: “We made a complaint to Uefa representatives after the match. They also made their investigations. Uefa will evaluate the issue. We are in talks with lawyers. We will file a lawsuit for compensation to Uefa. We will ask for our victimisation in terms of salary to be eliminated.”
Following the incident, Lang underwent surgery in an attempt to repair the damaged thumb.