Nigel Pearson believes his Leicester City players have the resilience to stay in the Premier League despite falling six points adrift of safety at the foot of the table.
Only two Premier League teams have survived being bottom at Christmas.
"We are finding life very tough because the margins are so tight," he said after Friday's 2-1 defeat to Tottenham.
"To stay here we have to up our level and resilience and I have every faith in the players to do that."
The Foxes are now without a league victory in 13 matches, having last won against Manchester United on 21 September.
|Leicester City's Premier League record since beating Manchester United 5-3|
|Played||Won||Lost||Drawn||Goals scored||Goals against|
Leonardo Ulloa's second-half equaliser, after Harry Kane's opener, gave the hosts Boxing Day hope but Christian Eriksen's winner punished a host of missed chances from Pearson's men.
Sunderland survived the drop from being at the foot of the table 12 months ago, while West Brom achieved it a decade ago with Pearson as Bryan Robson's assistant manager.
The Leicester boss said: "I don't know where the black cat is and whether we have run it over but it is a particularly disappointing outcome because our performance was very good. We caused them a lot of problems but are falling short of seeing games through.
"We will keep going. You can never submit to the negativity from external avenues. We have to make sure we remain positive of what we are capable of. We have to keep knocking until the door yields."
Leicester travel to fourth-from-bottom Hull City on Sunday six points behind the Tigers, with Steve Bruce's men ending a 10-game winless run at Sunderland on Friday.
Bruce, whose side finished 16th last season, said: "We've got a huge game next up against Leicester who are up against it like us. I still believe we'll finish above where we did last year.
"We've been blighted by a little bit of loss of a form and injuries. It's been difficult and it's still going to be difficult."