St Helens prop Alex Walmsley faces a lengthy spell on the sidelines after fracturing a bone in his neck during their win against Warrington Wolves.
The 27-year-old came off in the second half of their 30-12 victory at the Halliwell Jones Stadium on 9 March.
The England international has had an operation to correct the damage but is expected to make a full recovery.
"It's a massive blow given that Alex is the best front rower in Super League," head coach Justin Holbrook said.
"He has been in great form already this year after a good World Cup. But importantly, the news that Alex will make a full recovery from the injury is one we all welcome.
"We have a strong squad at Saints and I'm sure that the rest of the team will step up in Alex's absence."