Leicester manager Ranieri even believes his side go into the tie as underdogs because Milwall have already knocked out Bournemouth and Watford.
Ranieri’s champions are in a black hole – they have lost five on the spin in the league and have not scored a Premier League goal for over 10 hours.
They are hurtling head first towards the relegation places and Ranieri insists safety is his No1 priority.
Claudio Ranieri will make numerous changes for the FA Cup tie against Millwall
Millwall have knocked out Bournemouth and Watford
“Our target is the Premier League – that’s it,” he said. “ Of course we’re playing in the FA Cup and the Champions League and want to do our best but our aim is to be safe.”
He made 10 changes in the last round and still needed a replay and extra-time to knock out an under-strength Derby side.
Ranieri said: “Millwall are in good shape and are winning games – everything is fantastic for them at the moment.
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Non-league Sutton United had reason to celebrate in 1989 when they eliminated top flight Coventry in the third round thanks to goals from Tony Hains and Matthew Hanlan
“We know it will be tough. They beat Watford and Bournemouth who are above us. We are the underdogs.”
But he is not tempted to field a full-strength side and go for it with a last 16 Champions League clash against Sevilla next week.
“I always want to protect my first eleven. If we win then it’s okay and if we lose then the manager made a mistake. I prefer to take my responsibility,” he said.