A legendary figure for the Lions, Harris scored a club-record 138 goals across two spells as a player before embarking on a successful four-year stint as manager that yielded promotion to the Championship in 2017.
Exhausted, he stepped down two years later and has since spent time in charge at Cardiff, Gillingham and, most recently, Cambridge.
Harris, though, has always maintained that he'd be open to a return and when the disastrous 19game reign of rookie boss Joe Edwards was terminated on Wednesday, the 46-year-old quit the U's to answer Millwall's SOS.
"I was always very clear that I'd be here for the club when needed," said Harris, who started the season at Gillingham and joined Cambridge in December, thus achieving the unusual feat of managing at all three levels of the EFL within a single campaign.
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SEASIDERS' EVANS LEADS BY EXAMPLE
BLACKPOOL assistant coach Steve Agnew was delighted with his team’s performance as they confidently saw off the threat of Burton Albion at Bloomfield Road.
CHRIS' GUTSY BLUE BATTLE BACK TO NAB THE TOP SPOT
CHRIS Davies conceded his Birmingham City side were not up to their usual quality despite beating Peterborough United in a thrilling encounter.
WELLENS SLAMS ORIENT SUBS
LEYTON Orient boss Richie Wellens bizarrely criticised his substitutes’ efforts after his side were held at home by leaders Wrexham.
HARRIS HAILS HIS DOMINANT LIONS
North End outfought at The Den
ROONEY'S JOY AFTER ARGYLE HIT HATTERS...
WAYNE Rooney could not contain his delight after his Plymouth side breezed past Luton on Friday night.
RAMS LEFT FUMING OVER SAINZ STRIKES
NORWICH manager Johannes Hoff Thorup supported calls for the introduction of VAR in the Championship – even though he benefited from two major refereeing errors in his team’s win at Derby.
CARRICK'S CHUFFED WITH STARLET DOAK
MICHAEL Carrick thinks exciting winger Ben Doak has shown how determined he is to develop at Middlesbrough after helping to secure victory over Stoke City at the Riverside.
'Mature' Leeds are class above Cov
DANIEL Farke praised the “maturity” of his Leeds United side after they thumped early-season strugglers Coventry City with a dominant display at Elland Road.
SKIPPER TRAVIS IS TOPS FOR EUSTACE...
DELIGHTED Blackburn boss John Eustace lauded ‘inspirational’ captain Lewis Travis after his goal set them on their way to victory over 10man QPR.
BLADES BLUNTED BY PEPPY POMPEY
CHRIS Wilder heaped praise onto winless Portsmouth after they held his Sheffield United side to a goalless draw at Fratton Park.
