With straight wins to their credit - including two wins over higher League opposition in the FA Cup - boss Brian Laws will not make any changes to the side.
It means Nathan Stanton will again have to settle for a place on the bench, with Cliff Byrne keeping the right-back spot.
And with second-placed Swansea not in action until Wednesday, when they face a tricky trip to Oxford, United could put eight points between them and the chasing pack.
Cambridge will bring recall former Iron midfielder Justin Walker to their side.
Walker, who featured in the 1999 promotion-winning side, has served a three-match ban after being sent off against Rochdale in November.
The Us will hand a debut to defender Matt Somner, on loan from Brentford, and could bring back midfielder Darren Quinton and defender Adam Tann following injury.
Tuesday night fixtures:
Bristol Rovers v Chester
Bury v Wycombe
Cambridge v Scunthorpe
Darlington v Mansfield
Cods v Notts County
Leyton Orient v Southend
Macclesfield v Lincoln
Northampton v Cheltenham
Shrewsbury v Rochdale
Yeovil v Kidderminster
Wednesday fixtures:
Boston v Rushden
Oxford v Swansea
