Cardinals manager Oliver Marmol told reporters Friday that Walker (abdomen) could begin his rehab assignment with Triple-A Memphis as soon as Saturday, John Denton of MLB.com reports.
Walker landed on the 10-day injured list Wednesday due to appendicitis. He was able to avoid surgery after being treated with antibiotics and could be reinstated from the IL when eligible next Wednesday, per Denton. Walker has gone 3-for-18 with three runs scored since returning from a left wrist injury in mid-June.