Successful return for Wigan Athletic duo
Joseph returned to the first-team bench at the weekend after almost three months out with a back injury, coming on as a stoppage-time substitute.
Merrie, meanwhile, had been out since mid-February with a hamstring problem.
Both came through unscathed, which will be more good news for Leam Richardson and the club's survival hopes.
Sean McGurk's last-minute penalty earned the U23s a point, after Sam Tickle's own goal had given the visitors the lead.
The Latics XI included five trialists, one of whom came close to scoring only to find the side-netting.
Frankie Bunn's side travel to Crewe on Wednesday (1pm).