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From that Tribune article:
Walker is recovering from tendinitis in his right foot — specifically, posterior tibial tendinitis; the tendon that attaches the calf to the bones on the inside of the foot.
"Once he gets the boot off," Servais said, "he’ll start doing some mobility stuff. It’s kind of what we thought it was all along. It’s something he should be able to pitch with. He’s going to have to figure out the best way to manage it."