The Rays placed Walls (hip) on the 10-day injured list Wednesday.
Walls is working his way back from last October's surgery to repair a labral tear in his right hip. According to MLB.com, Walls has been hitting in the batting cage, fielding grounders and throwing during spring training, and he's set to meet with a doctor Monday to get a gauge of where he stands in his recovery from surgery. Since he'll need to go through a spring training-esque progression that likely includes a minor-league rehab assignment once he's cleared to intensify his baseball activities, Walls might not be ready to make his season debut until late April or early May.