Leyton Orient captain Stephen Dawson needs a late fitness check.
The midfielder suffered a calf injury in training late last week which ruled him out of Saturday’s defeat at Sheffield Wednesday, and he is rated 50/50 to return.
On-loan defender Tom Clarke was ineligible for the first round but is now available as parent club Huddersfield have been knocked out of the competition.
Fellow loanees Lee Cook and Ben Alnwick are also able to play but Millwall do not want their defender Tony Craig cup-tied so he misses out.
Centre-back Ben Chorley returned on the bench at Hillsborough after a six-week lay-off with a back problem and should be involved again but midfielder Dean Cox (knee) is still out.
Strike duo Jo Kuffour and Frank Nouble will be missing when Gillingham travel to Leyton Orient in the second round of the FA Cup.
The on-loan pair, who have scored five times each this season, have not been given permission to play by their respective parent clubs.
Top-scorer Danny Kedwell is, therefore, expected to lead the line on his own, as he did in the first-round replay against Bournemouth.
Matt Lawrence will join Kuffour and Nouble on the sidelines as he serves a one-match ban for picking up his fifth yellow card of the season.
Charlie Lee should fill Lawrence’s right-back berth, while midfielder Chris Whelpdale could also be back from a chest infection.
Defender Danny Jackman (hamstring) is a doubt, while midfielder Danny Spiller (ankle), defender Barry Fuller (knee) and striker Adam Birchall (knee) are all long-term absentees.