Chelsea players need to 'give themselves a good slap round the face' after stumbling to a 2-1 defeat against Crystal Palace yesterday.
The Blues have won just four points from their opening four games to leave them eight points adrift of early pace-setters Manchester City already.
Boss Jose Mourinho is under pressure and hit out at his team yesterday following their performance, with the Special One admitting that 'two or three' of his players are facing the possibility of being dropped for their next game after the international break against Everton.
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Mourinho has also been contending with the scandal surrounding his decision to publicly criticise club doctor Eva Carneiro and physio Jon Fearn.
Radamel Falcao looked to have salvaged a point for Chelsea before Joel Ward consigned the Blues to only their second ever defeat at Stamford Bridge under Mourinho - and while Neville was full of praise for the Eagles he remains adamant that Chelsea are in serious trouble.
"Incredible credit to Crystal Palace, but the focus will be on Chelsea," he told Super Sunday.
"We refused to believe on Monday Night Football a couple of weeks ago that there were big problems, that it was just a bad start to the season. But I have to say that, listening to Jose Mourinho after the game saying how concerned he was, I'd be concerned now.
"The players need to give themselves a slap around the face. I don't know what it is at this moment in time, but I think the international break has come at a good time for Chelsea. It'll allow them all just to get away and reassess what's going on."
Neville believes the reason behind Chelsea's slow start to defending their Premier League crown is a simple one - fatigue.
"They look absolutely knackered – they look absolutely shot to pieces," he explained. "We talked about Manchester City last season when they were champions, not being able to get themselves back up for it again.