Four-time Pro Bowl tailback Priest Holmes, who returned to the field with the Chiefs last month following nearly two years of inactivity, is considering retirement after re-injuring his neck in last Sunday's loss to the Colts. Holmes, 34, has spent the past few days counseling with family members and friends and speaking with medical experts, two sources close to him told ESPN.com on Tuesday night. He is expected to reach a decision on his future shortly.