Halifax have lost two of their first three fixtures in 2014, including last week’s 10-8 home reverse against Batley Bulldogs.
Harrison said: “It’s going to take time for the team to gel, but that’s not an excuse.”
He added: “I don’t worry about Sheffield or any other team’s results. I worry about our own results. We’ve got a few issues ourselves that we need to talk about before this game.”
Danny Cowling should be available for Halifax, while Sheffield’s Will Hope is expected to miss out with a knee injury.
Eagles coach Mark Aston is demanding a major improvement after last week’s 24-18 defeat against Barrow Raiders.
He said: “Too many people were not at the races. There’s no excuses, the team wasn’t good enough.”