Aitor scored Panathinaikos’ goal in the 11th minute in the match played at Apostolos Nikolaidis Stadium. The goals of Atromitos, coached by former Galatasaray player Sasa Ilıc, were scored by Karol Angielski in the 25th minute and Denzel Jubitana in the 42nd minute.
Coach Terim suffered his first defeat while managing Panathinaikos.
Samet Akaydın, hired by the green-white team from Fenerbahçe, and Anastasios Bakasetas, transferred from Trabzonspor, played in the first 11.
The rematch of this match will be played on Wednesday, January 31.