That means he will need to be placed on the disabled list and would need to miss at least the first three games of the Giants series March 31-April 2.
March 31 is the D-backs' home opener, which Ross missed last year when he was on the disabled list.
"Definitely on track for March 31, but with the rules being if they put me on the DL, I'll miss the first three days of the season, the home opener, which is a bummer," Ross said. "This is my second one I'm missing in two years, which stinks."
Ross has yet to play in a Cactus League game. His activity has been confined to Minor League games and he is yet to play defense, something he hopes to do next week.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.