Walter Mazzarri admits he will have to tear up his tactics after Alan Pardew's sacking as Watford prepare to host manager-less Crystal Palace on Boxing Day.
Mazzarri lamented football's manager-sacking culture on Thursday but is equally wary of the threat a team can pose after losing their boss.
Palace, 17th in the Premier League, sacked Pardew on Thursday and are holding talks with Sam Allardyce to replace him.
And Mazzarri, a man familiar with regular shock managerial exits during his time in Italy, fears an instant turnaround could be on the cards.