Millwall stretched their unbeaten run to 14 matches after a 0-0 draw with Chesterfield at The Den in Sky Bet League One on Tuesday night.
Neil Harris made six changes from Saturday's Emirates FA Cup victory over reigning Premier League champions Leicester City, with Jordan Archer, Shaun Cummings, Jake Cooper - missing through suspension - Calum Butcher, Shane Ferguson and Steve Morison making way for Tom King - making his Football League debut - Mahlon Romeo, Shaun Hutchinson, David Worrall, Ben Thompson and Lee Gregory.
The Lions could have taken the lead just three minutes in, but Byron Webster just failed to connect with the ball inside the six-yard box following Shaun Williams' corner.
Three minutes later, Aiden O'Brien found Worrall, but his shot across goal could not find its way into the back of the net, despite a couple of deflections.
Gregory was presented with a golden chance to put Millwall in front with 10 minutes on the clock, but after good work from the striker and Worrall, he fired his effort over the crossbar.
The Lions were pressuring the Chesterfield back-line from the first whistle, but it was The Spireites who perhaps had the best chance of the early stages, with Tony Craig having to superbly block Liam Grimshaw's goal-bound effort on the goal-line.
Gregory forced a save out of Spireites goalkeeper Thorsten Stuckmann on 36 minutes, as the stopper rose to tip the forward's header over the crossbar in the last real action of the first-half.
The second-half began in similar vain to the first, with Millwall pressing their opponents, but they could not fashion a clear-cut chance on goal. Williams bent a free-kick around The Spireites' wall just before the hour-mark in the only shot of note.
Harris replaced Worrall with Ferguson on 63 minutes as The Lions looked for a different option, with Butcher and Harry Smith also entering the field of play with just over 10 minutes to go, replacing Thompson and O'Brien.
Gregory controlled King's long kick superbly as the clock ticked into injury-time, but his fierce strike was met well by Stuckmann.
After five minutes of injury-time, referee Robert Jones blew his whistle on a night that The Lions will perhaps feel frustrated by, but as a result, they stretch their unbeaten run to 14 matches.
Millwall: King, Hutchinson, Craig, Williams, Worrall (Ferguson, 63'), Thompson (Butcher, 79'), Gregory, Onyedinma, Romeo, Webster, O'Brien (Smith, 79'). Subs not used: Girling, Cummings, Martin, Abdou.
Chesterfield: Stuckmann, Jones, Hird, Evatt, Gardner (Dimaio, 85'), Martinez, Ebanks-Blake (Simons, 76'), Mitchell (Beesley, 89'), Faupala, Dennis, Grimshaw. Subs not used: Allinson, Kakay, Humphreys, Brown.
Referee: Robert Jones
Attendance: 9,005 (112)