Smith has joined the npower League One strugglers on a one-month loan deal from Norwich and is fit to feature against John Hughes' side.
Johnson inherits a Latics side placed 21st in the npower League Two table after he was confirmed as Paul Dickov's permanent replacement.
His first task will be to halt a run of three consecutive league defeats which has left his side two points from safety.
The youngest manager in the Football League will be without Matt Smith (knee) and Cliff Byrne (ankle) who both remain absent.
Johnson has no other injury or suspension concerns with Kirk Millar, Cristian Montano and Robbie Simpson all hoping for a change in selection under the new regime.