Defender aims to shake off injury worry.
Dunne's men will be seeking revenge over the Sky Blues, having been defeated 3-1 at the Weston Homes Community Stadium earlier in the season.
The U's are boosted by the return of Bradley Garmston after he missed the game on Saturday, whilst Kem Izzet also travels to the Midlands having come through recent U21s fixtures unscathed.
Joe Dunne does have experienced Matt Heath available to complete a trio of centre halves in the squad alongside Josh Thompson and Magnus Okuonghae should Eastman not make the coach for the trip to the Ricoh Arena.
Tom limped off in the game against Crewe on Saturday, having previously helped the U's to three successive clean sheets in recent matches.
The U's will wait on defender Tom Eastman as they prepare for their trip to Coventry City on Tuesday night.