England winger Ryan Hall looks set to miss Leeds Rhinos' opening engage Super League game against Bradford Bulls.
Hall suffered what coach Brian McDermott described as a "really bad dead leg" in yesterday's 40-18 pre-season defeat at Featherstone Rovers.
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Hooker Paul McShane sustained a broken nose and a thumb injury, but is expected to be available for Friday's trial game at Crusaders.
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Prop Ryan Bailey withdrew from the side due to a groin problem, but winger Michael Coady (shoulder) and back-up hooker Liam Hood (leg) also picked up knocks.
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McDermott said: "Ryan's the concern. I have already been told it's going to be a matter of weeks before he's back."
Fielding 11 players with Super League experience, Rhinos trailed 22-0 at half-time and conceded a total of seven tries.
Of Leeds' performance, McDermott said: "Structurally we were going to
struggle. We had a 16-year-old stand-off and a fella who's only just come to rugby league playing (at) seven.
"That's where we were exposed, but in terms of individual performances I thought there were some real good ones – Kallum Watkins and Ben Jones-Bishop and Paul McShane in his second stint especially.
"Both front-rowers produced a really tough, workmanlike performance and Jay Pitts was outstanding.
"In terms of a tool for pre-season, it was very good – it massively served a purpose.
"We want to win games and it was disappointing we lost, but in terms of
what did we get out of it – we got a lot."
Rovers coach Daryl Powell was delighted with his side's effort.
"It was a good Leeds team and I am pleased with the way we performed," he said.
"We defended really well. They really challenged us in the second half, but we stood up to it well.
"They got a couple of tries from dummy-half, which were disappointing, but overall it was a really strong effort with some high-quality individual performances.
"Liam Finn was sensational, he pulled the strings and got us round the field.
"His pass and kick execution was excellent.
"On the back of that, Matty Dale was really good and so were Greg Worthington and Andy Kain."
Rovers also picked up a series of injuries, with Ross Divorty (knee), Stuart Dickens (ear) and Andy Bostock (eye) all suffering knocks.
Meanwhile, Brian McClennan, who stepped down as Leeds coach last October, has been appointed coaching and development manager of the Auckland Rugby League on a two-year contract.
McClennan, who will mentor and appoint coaches, said: "I am pretty excited by it. It's really good to stay involved in the game.
"I am just happy to be doing something for the game."