BERLIN, Dec 10 (Reuters) - Arminia Bielefeld coach Ernst Middendorp was sacked on Monday and will be replaced by amateur team coach Detlev Dammeier for this weekend's Bundesliga match against VfB Stuttgart .
'The facts don't lie - we have only five points from the last 11 matches,' managing director Reinhard Saftig told a news conference in Bielefeld. 'I don't even want to start counting up the goals we've allowed.
'There were matches there that I didn't think it could get any worse, but it did,' he added.
Bielefeld were beaten by Borussia Dortmund 6-1 on Friday.
The club announced the decision after a supervisory board meeting.
Bielefeld have won just one of their last 11 matches in all competitions. They are 15th in the league with 15 points, just one point off the relegation zone.
It was the third time the club has sacked Middendorp. The 49-year-old also coached them from 1988 to 1990 and 1994 to 1998.
He was hired for the third time on March 14 and helped them avoid relegation last season with a late four-match winning streak.
'It's an emotional thing for me,' said Middendorp. 'I've been attached to the club for 20 years.
Middendorp is the second Bundesliga coach to lose his job this season after Petrik Sander of Energie Cottbus was sacked.
Bielefeld will search for a permanent replacement during the winter break after Saturday's match.