The Republic of Ireland international was brought to Oakwell during February as cover for Stephen Foster. who has now returned to the squad.
And Robins concedes McShane is almost certain to head back to the KC Stadium at the end of his two-month spell with the Reds.
He told BBC Radio Sheffield: "I've looked at that and I'll keep pushing but I don't think we'll be able to."
Source: PA
Source: PA