The England international goalkeeper has overcome a broken foot but accepts that it will be difficult to shift Wales No.1 Boaz Myhill from his place in the first team
The 30-year-old has handed caretaker head coach Keith Downing a timely boost in the wake of Steve Clarke's removal as manager by declaring himself ready to resume first-team duties if needed against Hull City on Saturday.
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"It has been a long slow recovery but I'm really, really happy to be back," Foster told the club's official website. "That's me fully fit now.
"We'll have to wait and see what happens on Saturday. Boaz and Luke [Daniels] have both done very well.
"Bo has been great. I know exactly what Bo can produce and his performances haven't surprised me. He's an international goalkeeper and he's been absolutely brilliant."