Gillingham have sacked manager Martin Allen following their 2-0 defeat to Shrewsbury on Saturday.
A statement on the club's website thanked Allen for helping the Gills to achieve promotion to League One as champions last season but said it was in the interests of the club to make a change now.
Chairman Paul Scally said: "It is always a hugely difficult time when a managerial change occurs and this moment is no exception, and whilst the decision taken was made unanimously by the board, it was an exceptionally difficult one, but one which after long deliberation was felt absolutely necessary.
"I would like to wish Martin every success in his future career, I have no doubt he will be back managing very shortly and I have very much enjoyed the experience of working with him, on both a business and personal level over the past 16 months."
Gillingham won exactly half of their 46 league games on their way to the League Two title last season, losing only nine, but have found life tougher in League One, winning just two of their 11 games thus far.
He becomes the third League One manager to be dismissed this season, following Carlisle's Greg Abbott and Sheffield United's David Weir.