Foster is back in training after being on the sidelines since the end of August with a broken foot.
The 30-year-old is ready to step up his training programme in a bid to be available for Steve Clarke for the busy festive period.
"In the next week or two I should be fairly good to go again," Foster told the Express and Star. "It's going to be quite intensive training.
"It will take a while to get my eye back in again and get my body used to diving about again.
"I've only been diving around for a couple of days and my body is killing. There is only so much you can do in the gym to keep yourself fit.
"But the tiredness you get from diving around and your muscles taking beatings every day it's different - I've been going home and sleeping."
Foster admits the extended spell on the sidelines has been a struggle for him physically and mentally.
"The four months I've just done has been a horrible time," added Foster. "It's probably been the worst injury I've had in terms of being limited with what you can do in your rehab.
"It takes a lot of getting over mentally; just getting back into the full swing of things and diving about.
"You've just got to try and trust it, trust the scans, which say it is healed and clean.
"I've just got to try and forget about it - but it is hard. I'm trying to learn to put it to the back of my head."