The winner will secure their place in Super League for 2017 while the loser must face the uncertainty of the Million Pound Game to save their status.
Gifted scrum-half Kelly has been suspended internally for the last two games having returned late from a trip home to Australia with his future at the East Yorkshire club up in the air.
However, given the importance of this weekend’s game, there is increased speculation Rovers may include him in their 19-man squad which is named later today.
Stone worked with the 25-year-old while he was playing for Newcastle Knights’ reserve grade in 2012 and said: “Alby’s a threat if he plays.
“I’m not sure if he will – I don’t know the ins and outs of their situation with Alby.
“I’ve had a bit to do with him at Newcastle and I know he’s a terrific, dangerous player.
“On his day he can be a real damaging player and hopefully we’ll be ready for him if he does play. He has a good running game with a lovely left-to-right pass.
“He can do things other people can’t and if he plays he’ll give them a chance. But I don’t know the full scenario – it’s not my business – and I’m just preparing to beat his team.”
Meanwhile, treble-chasing Hull FC’s hopes of attaining the League Leaders’ Shield tomorrow night have increased after opponents Warrington Wolves suffered a double injury blow with the loss of Kurt Gidley (hamstring) and Ben Currie (cruciate ligament).
York will not be allowed to go up to the Championship even if they win the League 1 promotion final because they have no permanent home.
The City Knights have been homeless since leaving the Huntington Stadium two years ago and have so far been unable to reach agreement to play at Bootham Crescent until a proposed new stadium is built for both the city’s rugby league and football clubs.
The RFL says that makes York, who take on Toulouse in the first play-off semi-final on Saturday, ineligible for promotion.