New trio on Doncaster trip
All three new signings are included in the nineteen man squad for the game at the Keepmoat stadium.
Jack Compton and George Porter both came on as second half subs at Crawley, and they are joined by latest addition, Dominic Samuel.
Samuel put pen to paper on Thursday morning, signing a month's loan deal from Reading.
Dunne is also boosted by the news that Josh Thompson is eligible, having signed a permanent deal to remain at the U's following his loan spell in north Essex.
Fellow defender Dan Potts won't be with the U's at Doncaster though, having been recalled by West Ham ahead of their FA Cup tie against Manchester United.
U's: Cousins, Pentney, Rose, Wilson, Heath, Thompson, Okuonghae, Izzet, Bond, Bean, Wordsworth, Gilbey, Porter, Compton, Wright, Sears, Massey, Morrison, Samuel.