The Welsh international pledged his desire to join the Blades but Kevin Blackwell has revealed there are some stumbling blocks in the deal. The 20 year old made an enormous impact in his 3 month loan spell at the Lane.
United gaffer Kevin Blackwell said: "Cotts wants to be here and we would love to have him. We are continuing negotiations with Wigan, although there are a couple of stumbling blocks at the moment.
"He made a great impression last season and his pace and trickery would be a real asset for us in the forthcoming campaign. I remain hopeful that we can make it happen on our terms, but in football you can never say it will definitely happen because things can change so quickly."