BEES keeper Nikki Bull faces up to four months out with a shoulder injury.
The former Aldershot shot-stopper has been on the treatment table since getting crocked in training two weeks ago.
And he is due to go under the knife tomorrow after an injection failed to clear the problem.
Brentford boss Andy Scott said: "Nikki had an injection that didn't work. He saw a specialist again on Thursday and he's got to have an exploratory operation on Tuesday.
"That could mean he's out for anything from six weeks to three or four months, and obviously he would need to get fit again. It's a massive blow."