Manchester United defender Rio Ferdinand has described Chelsea's decision to sack Roberto Di Matteo as "madness".
Di Matteo was axed on Wednesday morning following the Blues' damaging 3-0 Champions League defeat against Juventus in Turin.
The loss has left Chelsea on the verge of elimination from a competition Di Matteo memorably won in May to persuade owner Roman Abramovich to appoint him full-time in the summer.
Abramovich is now, however, looking for a ninth manager since he took over the club.
Ferdinand, who has only worked under Sir Alex Ferguson during his decade at Old Trafford, wrote on his Twitter page: "Wow, Chelsea have sacked their manager!! I'm a bit late I know but its a madness.
"The stability at our club is something our manager rarely gets praise for...don't under estimate that. #LambChopped."
Newcastle manager Alan Pardew also has expressed his astonishment.
Pardew said: "I'm astonished, really. It just goes to show you how precarious we are as Premier Leag...