Parramatta lock Nathan Brown is expected to miss the next three months after suffering a pectoral injury during the Eels' 20-12 win over Penrith on Sunday.
Brown sustained the injury during the 17th minute, after a tackle on Panthers lock James Fisher-Harris went wrong.
The 26-year-old was helped from the field cradling his arm, with coach Brad Arthur delivering the news post-game.
"He's not good. I think it's his pec and that's three months," Arthur told the media after the win.
"It's tough but we lost a couple at the start of the week when we thought they might play. But Kane Evans and David Gower came in and got an opportunity and didn't let us down."