Getty White Sox center fielder Luis Robert has been cleared to begin a rehab assignment and will be on the field at High-A Winston-Salem on Wednesday as he comes back from a Grade 3 right hip flexor strain. “I’m excited for the process to begin,” Robert said. With left fielder Eloy Jimenez into his second week of rehab games, it was the latest piece of recent good news coming from the recovery corner of the Sox’ lengthy injury chain. Robert suffered the injury May 4 running out a ground ball. “I was afraid of not coming back this season,” he said Monday.