Christian Luyindama scored on his debut Europa League appearance for Galatasaray, but his side fell 2-1 at home to Benfica in the first leg of their round of 32 fixtures.
The forward joined the Fatih Terim's men during the January transfer window and has already scored once - in a cup game against Hatayspor - in his three games prior to Thursday's clash.
Luyindama, who already played six times in the competition this season at Liege, started against the Portuguese visitors and, in the 54th minute, cancelled Eduardo Salvio's 27th-minute opener from the penalty spot.
With 26 minutes left, striker Haris Seferovic won the match for the visitors, thus, setting up an uphill task for Galatasaray in the return leg in Portugal next week.