Brisbane hooker Andrew McCullough has been diagnosed with an MCL injury, after going down at training on Monday.
The Broncos rake will miss a number of weeks, although Brisbane's Head of Performance Paul Devlin didn't put a timeframe on his return.
McCullough will visit a surgeon later this week to determine whether surgery is necessary.
“He has had a scan today and he has got a fairly decent MCL injury so we will send him for a surgical opinion on that and go from there,” Devlin told broncos.com.au.
“We have seen some guys come back from MCLs in accelerated time now so we will hold some hope for that.
“They tend to heal pretty well, he will go into as brace and we will progress his rehab journey straight away.
“There is no more professional player especially with injuries than Andrew, so if anyone is going to get back really quickly, he will certainly be a candidate for that.”