"There was an excuse in 2009 for our performance because of injury but 2010,2011 and 2012,we have underperformed. Someone has to take responsibility for that."
Hawks chief executive Stuart Fox said Kennett's comments do not''warrant a response''.
Clarkson,regarded as one of the league's best coaches,took charge of the Hawks after the 2004 season. He is contracted until the end of 2014,having been made to wait until late in 2011 by Kennett before securing a new deal.