Okuonghae and Kent miss Dons trip.
The U's head to Milton Keynes without captain Magnus Okuonghae and fellow central defender Frankie Kent.
Frankie is out with a knee injury, whilst Magnus is beginning the road to recovery after an operation on his ruptured Achilles, sustained in last weekend's defeat to Coventry City.
Loanee Will Packwood, signed from Birmingham City earlier in the week, is in contention for an immediate debut after his arrival from St Andrew's as Tony Humes is forced to reshuffle his defensive line once again.
Otherwise, the U's are in good shape as they look to get back to winning ways against the Dons, who currently sit in fourth place in the League One table.
U's: Walker, Lewington, Hewitt, Clohessy, Eastman, Kpekawa, Packwood, O'Donoghue, Harney, Fox, Gilbey, Moncur, Eastmond, Szmodics, Watt, Massey, Sembie-Ferris, Sears, Healey, Bonne