Wakefield Trinity Wildcats forward Lucas Walshaw has returned to the club from Dewsbury Rams after biting off part of his tongue.
The 21-year-old second rower, who joined the Championship side on a season-long loan, was forced off in the Rams' game with Sheffield on Sunday after clashing heads with a team-mate.
Walshaw is now recovering with the medical team at Wakefield after spending time in hospital and Dewsbury coach Glenn Morrison admits he does not know when he will return.
"He's with the Wakefield medical staff and they are keeping us informed. Tongues usually heal pretty quickly so he should only be out for two or three weeks," Morrison said.
"It wasn't pretty. They couldn't stop the bleeding so they got him off and then saw the end of his tongue hanging off. He toughed it out and spent the night in hospital where they re-attached it with about a dozen stitches."
Walshaw is certain to miss Dewsbury's Challenge Cup fourth-round tie against Super League Wigan next Friday.
The youngster has been hoping to impress Wakefield coach Richard Agar at Dewsbury after falling out of favour. He previously spent time with Doncaster in the Championship.
Wakefield are currently ninth in the Super League with two wins from their first six matches.
On the latest Boots 'n' All Extra - we speak to the man who sold Bradford Bulls two years ago and Rob Burrow looks ahead to the top of the table clash between his Leeds Rhinos and St Helens
Who will win Friday's top-of-the-table clash?