Werder Bremen general manager Klaus Allofs described their capitulation to Panathinaikos in the Champions League on Tuesday as the most gutless display he has ever seen from his side.
Vangelis Mantzios, Giorgos Karagounis and Alexis Tziolis all scored in the second half to give the Greeks a resounding 3-0 victory.
The defeat left the Bundesliga side bottom of Group B and still without a win in their opening four games in the competition.
Allofs told the club's official website: "I have already seen some games in which we have played badly, but I can not remember one that we finished so without guts.
"That is the worst thing you can accuse a sportsman of, but today that is what we have to talk about."
Bremen's hopes of making the knockout stages are still alive, but Allofs is questioning whether they have a squad capable of making progress in Europe.
He added: "There potential is there, but quality is what you do out on the pitch.
"We will in the short term work on our mistakes, but in the medium and long term think even harder about whether this is the right composition for success.
"We were always laughed at when we stressed in the past years that the Champions League is not a piece of cake and that it is not normal to to be there five years on the trot, but perhaps this feeling is dominating in some of us."