Jackson, who has played both wing and prop for the Humberside team, is initially on a month's loan, but could be available for a permanent move. Like the former Leeds and Bradford centre, Carl Hall, who has joined Rovers on trial, he is in line to make his debut against Hull KR tomorrow.
Hall has been playing rugby union for Moseley, but the New Zealander is keen to return to league. "We have a very young team and our coach, Steve Simms, feels he needs a bit of experience and steadiness to go along with them," said the Featherstone secretary, Terry Mullaney.
Leigh's prop, Tim Street, has been cleared to play against Whitehaven after avoiding further punishment for his sending-off against Sheffield in the Challenge Cup last week.
The two Hunslet players sent off in the defeat by the amateurs of Ellenborough have had mixed fortunes. Chris Ross has been suspended for four matches but Rob Wilson has been found not guilty and has also been told that no action will be taken over another incident in the same match.
Jim Rudd, who kicked off the first Wembley Challenge Cup final for Dewsbury in 1929 and died on Christmas Day at the age of 98, is to have his wish granted by having his ashes scattered behind the goals at the stadium tomorrow.
"We do receive occasional requests of this nature but were especially touched by Mr Rudd's desire for his ashes to be scattered on the hallowed turf," said Wembley's press officer, Martin Corrie.
"He holds a unique place in the history of rugby league at Wembley."
The League and the BBC are encouraged by viewing figures for this year's competition, which peaked at 4.5 million for the Leeds-Castleford tie last Saturday and almost 1m for St Helens' match at Featherstone on BBC2 on Sunday.