Zaidu Sanusi started his second UEFA Champions League group game in a 5-1 home thrashing by Liverpool.
The left back was later replaced by Brazilian rival Wendell just before the hour mark as he struggled to contain the threat of Mo Salah, who fired a brace.
The Super Eagles defender was rated below average 6.1 by sofascore just ahead of Porto lowest ranked player, goalkeeper Diogo Costa, who let in five goals and got a 5.6 rating.
He was rated 6.4 against Atletico Madrid.
Porto best rated players versus Liverpool were Otavio, Toni Martinez and Mehdi Teremi, who each rated 6.6.
Porto averaged 6.29 on the night, which was above the rating earned by Zaidu.
The Portuguese giants are third in Group B with a point from two matches, five points behind leaders Liverpool.
Atletico Madrid are second on four points, while AC Milan are bottom with no points.
