Full complement for Dunne.
U's: Walker, Cousins, Olufemi, Dickson, Wilson, Thompson, Okuonghae, Eastman, Gilbey, Bean, Sanderson, Bond, Wright (David), Eastmond, Hubble, Watt, Wright (Drey), Massey, Sears, Morrison, Ibehre.
Joe Dunne's side will also have confidence on their side, being unbeaten in their four league matches and sitting in fifth place in the table.
Orient have started the season well, winning all four of their SkyBet League One fixtures to date, so will be coming to the Weston Homes Community Stadium in confident mood.
There are another couple of recognisable faces further back for Orient, with Lloyd James and Nathan Clarke making up the ex U's quartet for Russell Slade's table topping side.
Whoever does play will be up against an Orient attack familiar to the U's, with David Mooney and Kevin Lisbie leading the O's front line.
In his absence, young Tosin Olufemi proved to be a very able deputy, giving Dunne a selection decision for the left back slot.
He was without Ryan Dickson last weekend but the full back has recovered from a virus for Saturday's clash against Leyton Orient.
U's boss Joe Dunne has a full squad to pick from this weekend.