Captain Jackson will miss the game, while veteran winger Peter Beagrie will also have to sit out with a niggling injury.
Iron manager Brian Laws said "Jacko's gone over on his ankle, we'll have to wait and see but I would summise that he'll definately be out for Tuesday and possibly Saturday so we'll have to have a look at that.
"He's picking up little injuries at the moment that are hindering him but that's given us an opportunity to give Butler his debut and I thought he was terrific. The kid was superb and it didn't faze him at all.
"Peter has had a little run around today but he is still not right. Maybe in seven days time he might be somewhere near but at the moment he's got a long way to go."