Recent reports had suggested that the Sussex keeper was a doubt for the match because of a troublesome Achilles problem.
However, despite having to pull out of the team's golf day yesterday to manage the injury, the 31-year-old has claimed that he is more than able to take part in the upcoming five-day game.
"I think it was a bigger shock to me than anyone else that I was a doubt for the second Test. But I'm not. I'm completely fit and well," he told reporters. "The Achilles, it's purely a management thing. It feels good at the moment and the reason I didn't play golf is because I didn't want to potentially put it under strain or inflame it or anything else. I'm feeling good.
"Back to back Test matches come into play. Just one full rest day. I would rather have my feet up. We've got a rest after this Test but it's a quick turnaround. We spent a lot of time in the field. It was pretty tense. So a day off my feet was what was needed."
Prior made his Test debut for England back in May 2007 against the West Indies.