Andrew Davies and Matthew Dolan, both of whom have been carrying hamstring problems in recent weeks, trained this Tuesday, while Parkinson didn't completely rule Billy Clarke out of a place in his squad for the Millwall replay either.
Parkinson said: "Matty Dolan has trained today (Tuesday) and Andrew Davies has trained the past two days.
"We are going to talk about team selection this (Tuesday) afternoon. One of the topics will be whether we think he (Andrew Davies) is ready to start yet.
"Billy Clarke is getting ever closer.
"This game will probably be too soon for him to start but he is getting closer - he is not too far off."