Injury doubts ahead of Robins clash.
Midfielders David Fox and Sammie Szmodics both picked up knocks and could miss the game against the league leaders.
Captain Fox injured his groin/hip in the first half on Tuesday night, while youngster Szmodics took a whack to the foot late on but was able to continue to the final whistle.
Fox was replaced at half time by Alex Gilbey, who could now make his first start following an ankle injury of his own.
Saturday's game will be the U's third in succession against top six sides, with three points gained so far in the games against Oldham and MK Dons.
Three more against the Robins this weekend could take the U's out of the bottom four, depending on Coventry's result at Sheffield United.
U's: Walker, Lewington, Vincent-Young, Clohessy, Briggs, Gordon, Eastman, Harney, Wynter, Gilbey, Moncur, Fox, Lapslie, Massey, Sembie-Ferris, Hewitt, Szmodics, Marriott, Healey, Porter, Bonne