Midfielder Murtagh, right-back McCoy and on-loan QPR man Parker are all on international duty with Antigua and Barbuda for the CONCACAF Gold Cup qualifiers against Jamaica on Saturday and Guyana on Monday.
Wanderers boss Gary Waddock has vowed to make changes to his side following the 3-1 home defeat to Torquay on Tuesday but will pick the strongest side available to him.
On-loan Dagenham & Redbridge midfielder Stuart Lewis could be handed his first start for the club after making his debut as a 64th-minute substitute in the loss to the Gulls.
Striker Scott Rendell also came off the bench in midweek after missing the previous match against Port Vale to be with his partner following the birth of their son and he will also be in contention for a place in the starting XI.
On-loan midfielder Scott Davies remains at parent club Reading to continue treatment on an injured groin and Stuart Green is still missing with an ankle problem, while Jon-Paul Pitman remains a long-term absentee with his knee injury.
Source: PA
Source: PA