Gray (hamstring) will face hitters in a simulated session Sunday, John Denton of MLB.com reports.
Gray will pitch to hitters before Sunday's Grapefruit League game as the next step in his rehab process, but the hitters will not be permitted to swing. If all goes well, the right-hander may move on to throwing batting practice or a full simulated game. Gray's status for Opening Day remains uncertain, though the Cardinals are optimistic the 34-year-old will be able to pitch in St. Louis' opening series against the Dodgers.