The versatile Irish star admitted he'd never seen the players so devastated after Saturday's FA Cup loss at Southampton.
But he knows it's crucial we come out firing on all cylinders for Sunday's massive clash.
Everton have enjoyed a fine start to the season under David Moyes and, pending Saturday's results, will arrive at the Lane in the top six.
We've slipped down a few pegs after successive league defeats against Newcastle and Southampton.
With points at a premium and Everton also no doubt smarting after suffering the shock of the FA Cup third round at Third Division Shrewsbury, it should be quite a contest.
"The disappointing thing is that we're out of both cups now," reflected Gary.
"The league is our only hope of getting into Europe now and that was our main task at the start of the season.
"We've got to start improving our league form and hopefully we can qualify that way.
"We've got to start again. Southampton was a real thumping so we've got to start again against Everton and see how things pan out."
Gary Doherty says we have to wipe the slate clean and restart our bid for European qualification via the Premiership against Everton on Sunday.