Lions drawn at home in the Fifth RoundMillwall will play either Derby County or Leicester City at The Den in the Fifth Round of the Emirates FA Cup.
The Lions beat Watford in SE16 on Sunday and their reward is another home tie in the next stage of the competition.
Championship side Derby held current Premier League champions Leicester to a 2-2 draw in the opening tie of the Fourth Round last Friday and will do battle once again in a replay at the King Power Stadium on Wednesday 8th February.
"I'm very pleased to have been drawn at home again," Neil Harris told millwallfc.co.uk.
"Either team will make for a great Cup tie at The Den. Derby have been in great form in the Championship in the past few months and Leicester are the champions of this country.
"I'll be keeping a keen eye on their replay next week and look forward to what I'm sure will be an exciting game later this month.
"But for now our focus is completely on Walsall this Wednesday."
The Fifth Round tie will be played at The Den between 17th-20th February. Full details, including a confirmed date and ticket information, will be announced when finalised.
Millwall's Sky Bet League One game away to Rochdale, originally scheduled for Saturday 18th February, will be rearranged as a result of the club's Emirates FA Cup progress. A new date will be announced when confirmed.
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