Myall is an England Saxon international
Leeds Carnegie's Kearnan Myall will play again this season after a scan revealed his ankle injury is not as bad as first thought.
Leeds feared the utility forward had broken a bone during the 14-13 National Trophy semi-final win at Nottingham.
Director of rugby Andy Key told BBC Radio Leeds: "We feared he had fractured his ankle.
"That's not the case so we'd like to think that within the next two weeks he'll be back in action for us."
Meanwhile prop Juan Gomez is rated as 50/50 for Sunday's home game with Cornish Pirates as he recovers from a knee injury.
Backs Rob Vickerman and Tom Biggs are away on England Sevens duty in Hong Kong.
Key added: "With Kearnan there was no displacement and now it's down to him and the medical staff on how quickly he recovers.
"Juan got a nasty knock to his knee against Nottingham, so we'll monitor that over the next two or three days to see how he goes.
"The nice thing at the moment is that if Juan isn't fit we have Fosi (Pala'amo) back fit again and he was excellent off the bench last weekend.
"To now only have two or three players unavailable for Sunday's game at this stage of the season is fantastic for us."
BBC Radio Leeds has exclusive full commentary of Leeds Carnegie v Cornish Pirates on Sunday on 774 AM and online at bbc.co.uk/leeds. The build-up starts from 1445 BST.