Sean Dyche has confirmed that goalkeeper Nick Pope suffered a dislocated shoulder at Aberdeen.
But the Clarets don’t yet know how long they will be without their second England international keeper.
Pope suffered the injury early on in Burnley’s 1-1 draw at Pittodrie in the first leg of their Europa League second-round qualifying tie last Thurdsay night.
And the 26-year-old, just back from World Cup duty with the national squad, will now undergo further checks.
“He sees the specialist tomorrow,” said Dyche after Burnley had drawn 0-0 with Montpellier in their latest pre-season friendly.
“It’s a definite dislocation, we know that, but it’s the grading of it and how the specialist views it.
“Once he’s seen the specialist, we will have a much better view.
“We will wait and see on that and we have no timescales at the moment.”
The Burnley boss also confirmed that Robbie Brady had been taken off as a precautionary measure after feeling a tight hamstring just before half-time at Turf Moor against the French top-flight side.
The winger was into his second public warm-up game since recovering from a knee injury sustained last December.
“He’s just come back from injury and it was only a minor thing in his hamstring, so we took him off immediately,” Dyche added.
“He’s been out for a while and we don’t want any second injuries if we can help it, of course.
“He’s had a long period of recovery and been doing very well.”
With Pope out injured and Tom Heaton – whose own shoulder dislocation last September had opened the door for Pope to emerge onto the Premier League stage – recovering from a calf problem, Anders Lindegaard made his Burnley debut at Aberdeen.
But with the second leg of the European tie to come at Turf Moor on Thursday night, the former Manchester United keeper wasn’t risked in Sunday’s friendly.
“Anders had a tight thigh, so we had to be careful with that as well, so we are stretched in that department. But we’ve had a bit of that this pre-season,” said Dyche, who saw Adam Legzdins step in to keep a clean sheet.
“Barnesy has managed to get 65 minutes in today and we’ve had to be careful with him on his way back.
“Steven Defour is still not quite there yet, so we’re still missing some quality players and we want to get them fit and add to it in the market.
“We are looking at signing players and if we can get them in that will be helpful as well.”
Barnes appeared for only the second time in pre-season following a minor knee problem to potentially add to Dyche’s forward options.
And while there was no goal on show in the opening game played at Turf Moor this summer, Dyche saw the benefit of the first of two home friendlies the Clarets have wrapped around the high-profile visit of Aberdeen.
Mace Goodridge was one of three teenagers in the Clarets' side at the end
“The good side is that all the fit players are getting minutes and the young players are getting involved,” he said.
“I was pleased with some of the signs today. The Premier League comes quickly and these games are important.
“It wasn’t a great game and it wasn’t an amazing performance, but the fitness was good and some of the basics were good.”