The Daily Mail says James believes he has been unfairly excluded because of a knee problem he says is not stopping him being fit and ready for action.
He was seen blanking England general manager Franco Baldini as he walked off the pitch at the end of the warm-up at the Rustenburg Stadium.
Communication between James, the medical staff and the Italian coaches appears to be part of the problem, although the 39-year-old Portsmouth keeper is also thought to be unhappy with the way selection has been handled.
James has the support of England's senior players but not, seemingly, the manager.
Capello left it until an hour and 45 minutes before kick-off to select his goalkeeper and the choice backfired when Robert Green's mistake allowed the Americans to equalise.
But James was also unhappy at being denied a chance to impress in the final warm-up game, although he chose his words diplomatically on Saturday.
"I don't have a problem with the manager's selection but I am fit and well," he said.