The experienced defender has acknowledged that Jens Keller's men have repeatedly let their supporters down of late
The Bundesliga outfit were hammered 6-1 by Real Madrid in the first leg of their Champions League round of 16 tie before suffering a 5-1 defeat against Bayern Munich at the weekend.
Consequently, Howedes has acknowledged that their performances of late have been well below par, admitting that they were particularly poor at the Allianz Arena.
"It was not worthy of discussion, particularly the way we played in the first half [against Bayern], which was extremely embarrassing. That ruined the whole game for us and there can be no excuses," Howedes told the official Bundesliga website.
"We were tactically like a schoolboy team. It was really poor. We didn't get into the tackles and also committed some shocking individual mistakes. It was another bitter lesson for us.
"At the same time, you've got to remember that Real and Bayern are not the teams we have to measure ourselves up to, even if that cannot explain the margin of these defeats."
Schalke will be looking to get back on track on Saturday when they host Hoffenheim.