Stags' rivals sack manager
Former Dover and Gillingham manager Hessenthaler, 51, was shown the door after Saturday’s 3-1 defeat at 10-men Notts County.
Orient are 14th in the table after suffering back-to-back defeats, having won three of their nine League games, including a 2-1 home defeat by Mansfield Town last month.
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Hide AdHessenthaler was previously assistant to Ian Hendon and then Kevin Nolan and was initially appointed on a caretaker basis in April.
He signed a one-year deal in the summer after taking charge for the final five games of last season as the O’s finished eighth, six points outside the play-off places.
Orient are now looking for their eighth manager since Italian businessman Francesco Becchetti took charge in the summer of 2014.