Jonathan Greening's first injury in 14-years has pushed Albion's injury list to a 'critical' stage, Tony Mowbray has admitted.
The skipper's damage to his medial knee ligament means the Baggies now have 11 first-team players unavailable for selection due to injury.
The Baggies captain had to be withdrawn five minutes before the break with Ryan Donk also replaced after picking up a groin problem in the second period. To add to Albion's woes Mowbray was also without Jonas Olsson, Abdoulaye Meite, Leon Barnett, James Morrison, Luke Moore, Shelton Martis, Craig Beattie, Neil Clement and Ishmael Miller for the Clarets' trip.
"Our injury problems are getting worse," the Baggies boss bemoaned.
"Jonno has gone off with a medial knee ligament injury and, until we get a scan, it's hard to say how long he will be missing.
"I would suggest, even if it's a grade one injury, he will be at least two to two-and-a-half weeks out.
"He is undoubtedly our most influential footballer, and has been since I've been here.
"It's his first injury in 14 years so he's a bit distraught about it.
"Let's hope it's a short one.
"Ryan has gone off with tired muscles around his groin.
"If you add him to the centre-halves we've already got out in Barnett, Olsson and Meite, and all the others, the list keeps growing - and it's not good.
"I'm pretty sure we're not the only club suffering injuries but it's coming to the critical point for us.
Although down to the bare-bones with Premier League, Champions League and World Cup Championship champions, Manchester United set to visit on Tuesday (KO 7.45), Mowbray refused to panic and ruled out the option of signing new faces.
"We won't be bringing anyone in to cover our injuries," Mowbray continued.
"I would hope we'll have some of our injured players back, fit and available, in a week or two.
"In the meantime, it's an opportunity for the other players who haven't played much this year.
"Pele hasn't played much this year and we had a right-back in Zuiverloon coming on after a month out and playing at centre-half.
"We've just got to mix and match at the moment and get through it if we can.
"We'll try and put a team out that can give them a game.
"We want to compete with everyone we play.
"But you'd want to play Manchester United with as close to your best team as you can and hope they've got a few injuries.
"I know they have got a few out but I think teams like ourselves, with total respect to where we are, need to have our best team out on the field to give United more than a decent game.
"We will see who is available on Tuesday and go about it in as positive a way as we can."