The teenage centre is likely to feature against Rovers having just spent five games on loan with the East Yorkshire club.
Charnley – who made his Super League debut and scored five tries during that impressive spell – is yet to appear for hometown Wigan who are wobbling in their mission of securing the League Leaders' Shield.
He could be thrust in though tomorrow with the Warriors, who lost at home to Huddersfield last week, down on numbers and still requiring a point to finish top.
Morgan said: "It would be a huge ask for a kid that's a five-game veteran to play within only a few days of being recalled against the team he made his debut for. That would be a bit strange. But I don't know what Wigan's scenario is and what decisions they have to make.
"He was a great loan signing and obviously we would have loved for him to stay with us but that's the way it goes. I feel very proud to have contributed to his personal development but hopefully he doesn't come back and bite us on the backside."
Seventh-placed Rovers, unbeaten at Craven Park since Easter, have lost just once in eight games and mathematically could still finish as high as fourth.
Huddersfield, meanwhile, will bid to ensure Rovers do not overtake them in sixth when they entertain Salford City Reds, England prop Eorl Crabtree is set to make his 250th appearance.
Castleford, desperate to defeat Harlequins to keep their play-off ambitions alive, have seen back-row Ryan Clayton ruled out for the remainder of the season with a pectoral muscle injury.
Bradford are without winger Stuart Reardon as they host Wakefield tomorrow but Danny Addy returns for Lee St Hilaire's side as they seek a first win in 13 games with Trinity knowing a defeat would effectively end their season.
Co-operative Championship play-offs, preliminary semi-finals: Leigh v Sheffield Eagles, Barrow v Widnes (losers eliminated).
Qualifying semi-final: Featherstone v Halifax (winners through to Grand Final, losers to major semi-final).