After joining on loan from Keighley in the latter stages of last season, Sweeting made two appearances for Mark Dunning's squad, scoring a try in the 38-18 win over London Skolars.
Hooker Barcoe featured four times in total, making a try scoring debut in the 41-10 win at Doncaster in July, and will continue to provide strong competition in the role for Chris Cullimore and Elliott Windley.
With both players having already showed glimpses of promise for the club, Dunning is looking forward to seeing what they can add in the long-term.