Millwall manager Neil Harris says the only pressure that his side will feel when they take the pitch alongside the Premier League champions tomorrow will be the pressure they place on themselves.
"Are we expecting to get through? No, of course not," Harris told millwallfc.co.uk ahead of Saturday's Emirates FA Cup tie.
"But that means we can play with freedom and without fear. It's a challenge that we are going to embrace because have nothing to lose and everything to gain."
The Foxes have endured a stuttering title defence and currently sit 17th on the table, but Chopper believes the fixture will be viewed as an opportunity to breathe new life into the under-fire club.
"If Leicester come and perform to the best of their ability it will be a tough challenge for us. But if they don't, if they come with any fear to The Den then we will make it a tough afternoon for them."
By contrast, Millwall are twelve unbeaten and are eager to claim another Premier League scalp on their giant-killing run, having already seen off AFC Bournemouth and Watford earlier in the tournament.
"We are on a really good run of form. It's a chance for our boys to cause another upset, to take on the Premier League champions is a huge opportunity.
Leicester City boss Claudio Ranieri has hinted at making sweeping changes for their trip to The Den, with a date with Champions League rivals Sevilla scheduled for early next week.
Meanwhile, Millwall hope a number of recovering first-team players will be available for selection this weekend.
Centre-back Shaun Hutchinson is closing in on a return after suffering a leg knock last month, while Ben Thompson and striker Lee Gregory are also making progress after missing the mid-week victory over Port Vale.
"We don't know what kind of team Leicester will put out," Harris added. "But I will pick a team that I feel can compete with them and hurt them."
"Shaun Hutchinson is back in training and comes into consideration. Lee Gregory and Ben Thompson are similar, we will assess them right up until the match but we have other players ready to go too if the game comes too soon for them."