Tests revealed that Josh Johnson has ulnar nerve irritation in his right biceps area that will result in him being out at least two months. The Marlins' 23-year-old right-hander underwent a series of nerve tests in Jupiter on Monday. While the Marlins now must brace for life without one of their top young starters, the encouraging news is the medical staff is confident Johnson won't need surgery. "It's better than three months," said Johnson, who had a chance to be the Marlins' No. 2 starter. "I knew I wouldn't be out the whole year."