Gueret's last appareance for the club ironically came in the same round of the competition in 2002 when he replaced the suspended Tony Warner against Blackburn Rovers.
But with loan signing Andy Marshall ineligible, manager Dennis Wise has kept the popular Frenchman wrapped up in cotton wool rather than risk him against Stoke City on Saturday.
Daniele Dichio also plays after his loan spell was extended as The Lions try to hammer out a permanent move for the striker with his current club, West Bromwich Albion.
Millwall do have a doubt over David Livermore, who was stretchered off on Saturday but Robbie Ryan is on stand-by to make his first start since returning from injury.