Preston midfielder Alan Browne is having a scan on a hamstring injury on Monday.
Last season’s player of the year missed the 2-0 defeat at Derby on Saturday with North End now looking to confirm the extent of his injury.
Tom Clarke also had to sit out the Pride Park reverse with a groin problem.
Both are set to miss the League Cup game at Leeds on Tuesday night with Paul Gallagher serving the final match of his three-match suspension.
“We’ve got a couple of bodies and we missed a lot of experience on Saturday,”
“Tom Clarke, Alan Browne and Paul Gallagher were missing which certainly isn’t helping us at the moment.
“Tom’s groin is still niggling away and Alan is having a scan today.
“If someone’s struggling I’m not going to fling them in to this game.”