Paul Hurst bemoaned referee Charles Breakspear’s decision to send James Perch off as Scunthorpe lost at Cambridge.
Paul Lewis scored twice as unbeaten Cambridge beat 10-man Scunthorpe 3-2.
Cambridge boss Colin Calderwood hopes to have both Jabo Ibehre and Dan Jones available for Tuesday’s home game with Scunthorpe.
Cambridge manager Colin Calderwood hailed the character and perseverance of his players after they recovered from an “absolutely dreadful” first half to run out 2-1 winners at Colchester.
Substitute Harry Darling’s first professional goal was a late winner as Cambridge came from behind to secure a 2-1 victory at East Anglian rivals Colchester.
Defender Kane Vincent-Young could return for Colchester’s Sky Bet League Two clash with Cambridge.
Delighted Cambridge boss Colin Calderwood hailed his side’s defensive effort for causing one of the Carabao Cup’s big first-round upsets.
Toothless Brentford were dumped out of the Carabao Cup first round on penalties by League Two Cambridge after it ended 1-1 at Griffin Park.
New arrivals Dominic Thompson and Joel Valencia could make their Brentford debuts against Cambridge in the first round of the Carabao Cup.
Cambridge head coach Colin Calderwood hailed his side’s resolute performance in difficult conditions as they earned a point against Newport.
Cambridge secured their second successive goalless draw as they shared the spoils with Newport.