"We’ve got to decide what we do about that, we’re going to see somebody tomorrow (Tuesday) about that.
"It’s not a major problem, it’s not as if he’s going to need surgery or anything but it’s just that final bit, he’s just not himself in training."
There is better news regarding Billy Clarke, however.
The striker, who missed nearly three months with a knee injury, made a welcome return to action ten minutes from the end against Millwall.
Parkinson said: "It’s great to see him back and he’s trained well again today (Monday).
"It’s hard to get Billy off the training pitch, he wants to be out there all the time and improving and that’s what you want.