Mustafi headed home his first goal since February but it wasn't enough to secure three points against Vitoria on Wednesday. Bruno Duarte's stoppage-time equaliser saw the hosts rescue a point at Estadio D. Afonso Henriques.
Mustafi said, "I would love for them to not have scored in the 90th minute, but when you score a goal and still have time to play against a team like the one we played, they throw everything up front.
"Sometimes it's not organised any more, they throw a lot of bodies in the box, they keep crossing. We could have done better but in the end we have to accept it and take the point with us.
"Yeah I think we could have dealt a little better with it instead of letting them cross into the box again. In the end, you have to accept it, move forward and take the positive things into the next game."