The Montreal Impact fired coach Frank Klopas early Sunday.
The team said assistant coach Mauro Biello will take over on an interim basis.
Montreal lost 2-1 at Toronto on Saturday to drop to 8-11-5. The Impact earned only 11 of a possible 33 points in their last 11 outings -- a 3-6-2 stretch that started with a 3-1 loss in Toronto on June 24.
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The 48-year-old Klopas was in his second season with Montreal after coaching the Chicago Fire from 2011-13. Montreal was 6-18-10 last year in MLS play.
Biello is in his sixth year on the Impact coaching staff.