The 24-year-old was less than impressed with his side after falling further behind the leaders, whilst Horst Heldt admitted that Stuttgart were more deserving of victorySchalke defender Benedikt Howedes has lamented his side's league collapse after the 3-1 defeat by Stuttgart on Saturday.
A hat-trick from Vedad Ibisevic was enough to condemn Die Konigsblauen to a fifth league game without a win, as they slipped further behind runaway leaders Bayern Munich.
Schalke, who managed to top their Champions League group ahead of Premier League side Arsenal, have also now lost their last four league games in a row, bringing a rather blunt comment from Howedes.
"We are in the process of destroying our good position in the league, that sucks," the Germany international todl Bild.
But Schalke director Horst Heldt insisted that the side will assess themselves during the winter break, but first called for a win in the final round of games in 2012 next week.
"We must win the last match [against Freiburg] and reach the next round of the cup," he said.
"And then we will see where we are and we will judge the work of the team. Stuttgart were sharper, more passionate."
Schalke lie in fifth place in the Bundesliga, 16 points behind Bayern.