The midfielder, nursing a groin strain, withdrew from the Republic of Ireland squad before Wednesday’s 1-1 draw against Czech Republic.
He has not trained since but there is a chance he could be passed fit for the clash at St Andrew’s as City look to get back on track following last weekend’s shock 2-1 defeat to Nottingham Forest.
Midfielder Guirane N’Daw has now fully overcome his hamstring complaint and is fit for selection while striker Nikola Zigic made his return from a knee injury against Forest.
That leaves skipper Stephen Carr (knee) as the only definite absentee.
New signings Peter Ramage and Caleb Folan come into contention for their debuts, while forward Erik Huseklepp – fresh from international duty with Norway – and winger Andros Townsend will also look to feature having made their bows last Saturday.
Oxford chairmanSumrith Thanakarnjanasuth hopes to announce the club's new manager next week and says the successful candidate has the 'wow factor'.
Scotland coach Peter Grant believes Kieran Tierney can emulate his 'world-class' former Celtic team-mate Danny McGrain.
Leeds owner Andrea Radrizzani has publicly criticised the club's players following their slide out of Sky Bet Championship play-off contention.
Scotland under-21 boss Scot Gemmill believes Oli McBurnie and Scott McKenna are ready to make their senior debuts under Alex McLeish.