Walker joined the Cobblers on loan in November 2008 on a three month loan deal; making his debut in a 1-0 defeat to Oldham Athletic at the Sixfields Stadium.
With the Blades short at the back with Ugo Ehiogu injured for the remainder of the season and Matthew Kilgallon (flu) unwell its likley that the young starlet will feature against the O's, for whom they drew 1-1 when Town faced Orient early this month.
Having yet to feature for the Blades during his time at Bramall Lane its possible he may make his mark at Brisbane Road - maybe he could set the league alight like Kyle Naughton? He leaves Sixfields having made 9 league appearances during his loan spell.