Coventry moved five points clear at the top of the Sky Bet Championship after fighting back to beat Sheffield United 2-1 at Bramall Lane.
Harrison Burrows' deflected effort gave the Blades a deserved lead early in the second half before Frank Lampard’s side struck twice in five minutes to give their title hopes a major boost.
Haji Wright equalised four minutes after Coventry had fallen behind and Jack Rudoni’s header sealed their third straight win.
The Sky Blues, who held a 10-point lead at the top in November, were knocked off top spot by Middlesbrough earlier this month, but have regained momentum in their bid for a top-flight return for the first time in 25 years.
The Blades, who remain nine points adrift of the play-off places, were made to pay for a string of missed first-half chances.
Millwall got their bid to gatecrash the Premier League back on track by ending in-form Birmingham's unbeaten run with a thumping 3-0 victory.
Goals from Femi Azeez, Tristan Crama and Jake Cooper lifted the Lions back up to third, just four points behind second-placed Middlesbrough.
Birmingham arrived in south London undefeated in nine and with three successive away wins, but they were swept aside at The Den as Millwall bounced back from Saturday’s shock home defeat by lowly Portsmouth.
The Blues also had Colombian midfielder Jhon Solis sent off early in the second half on an evening to forget.
FULL LIST OF FIXTURES, RESULTS AND STANDINGS
Another bad day for Sheffield Wednesday ended on an all-too predictable low note as they lost 2-0 at Norwich – an 11th successive Championship defeat.
Having been relegated at Steel City neighbours Sheffield United on Sunday, the Owls were hit by the worrying news that a proposed £47.8million takeover by a consortium led by James Bord had collapsed.
And there was to be no relief on the pitch either, despite a battling display, as Norwich scored twice in seven minutes in the latter stages of the first half to record a comfortable win.
Substitute Mathias Kvistgaarden set the ball rolling after 31 minutes with a close-range header before a sublime strike from Paris Maghoma quickly finished the game as a contest.
Elsewhere, Stoke City are up to 13th following a 2-1 victory over second-from-bottom Oxford United.
Lamine Cisse gave the hosts the lead after half an hour but Northern Ireland international Ciaron Brown levelled before half-time.
Jesurun Rak-Sakyi's 57th-minute strike was enough to earn the Potters all three points.
