Influential on-loan midfielder Olofinjana has missed the last two games with a knee injury but trained on Sunday and will be monitored ahead of the Selhurst Park clash.
Chopra (ankle) has been playing through the pain barrier in recent weeks and completed 87 minutes of Saturday`s 2-0 home defeat to Ipswich.
But he will be checked along with full-back Paul Quinn, who also played at the weekend despite struggling with illness all last week.
Despite losing 2-0 to Town, manager Dave Jones has admitted it would be hard to make changes to his starting XI.
Goalkeepers Tom Heaton (groin) and David Marshall (elbow) continue to miss out long-term, meaning Stephen Bywater is likely to continue between the sticks ahead of fellow loan signing Jason Brown.
Source: PA
Source: PA