The Championship club have lost six of their opening seven games of the season.
"The club would like to place on record its' appreciation for Chris's efforts. Chris joined the club in a difficult period for everyone in football and around the world and we thank him for the way he has conducted himself during his tenure.
"Steven Reid will take temporary charge of the first team as interim head coach.
"The search for the permanent successor has begun and the club will update supporters in due course.
"The club would like to wish Chris all the best in his future career."
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