The midfielder is appearing before a commission in relation to alleged betting offences and could be handed a suspension - though there is no direct precedent - and any ban would mean he would have to come out of the Clarets' squad.
"We'll just have to wait and see what comes out of it," said boss Sean Dyche said of the hearing on Friday.
"It's something that is ongoing between himself, his team and the FA. We'll have to wait and see what comes of that."
Sam Vokes and Scott Arfield are both doubts for the Turf Moor showdown with respective hamstring and knee issues, but Johann Berg Gudmundsson could come back into the squad after recovering from a knee injury which has sidelined him since the FA Cup fifth round defeat at Lincoln City.
Provisional squad: Heaton, Robinson, Pope, Lowton, Keane, Mee, Long, Ward, Darikwa, Tarkowski, Brady, Barton, Flanagan, Defour, Boyd, Hendrick, Westwood, Arfield, Gudmundsson, Vokes, Gray, Agyei, Barnes.