Danny Bloor has apologised to Lewes fans following their Senior Cup humbling at Horsham YMCA in midweek.
The Rooks crashed out 4-1 to their County League division one hosts and Bloor has warned some players could pay the price for an under-par showing.
The management team of Garry Wilson and Bloor will now assess what went wrong as they concentrate on Ryman premier matters for the rest of the campaign.
Bloor said: “We made seven changes from the side that played Harrow Borough but the side we picked was more than strong enough to give a good account of themselves.
“It showed Garry and I that some of the fringe players are not going to be good enough.
“We would like to apologise to the supporters that travelled to Horsham. The second-half display was nowhere near good enough.
“No two people are more disappointed than Garry and I. But take nothing away from Horsham YMCA who deserved their victory.”
Jack Walder suffered an injured knee in the warm-up at Horsham YMCA and is a doubt for the trip to Met Police. Andy Pearson is also a concern after going off on Tuesday with a calf injury.
Bloor, though, insists the defeat should be put into context.
He added: “It isn’t doom and gloom. We have only lost five league games all season. We are on track, where we want to be but we will have setbacks here and there.”