The Scotland midfielder hasnât featured at all during Laticsâ pre-season programme because of back and knee problems.
âItâs too early to tell at this stage, but it is an area of concern for us,â Martinez told the Wigan Evening Post.
âJames is progressing well, but slowly. The back is something thatâs been bothering him for a while, and when we came back from Austria he felt it a bit more. Itâs one of those injuries that doesnât stop you from training, but when you do work hard it has a delayed reaction â and those are always the most frustrating.
âYou probably feel you can get away with doing little bits of training, and knowing James he is the kind of person who wants to do as much as he can.
âWe need to make sure he continues to get the right recovery and the right treatment, and weâll take it day by day.â