Injuries to the iliopsoas muscle are rarely mentioned in the literature dealing with soccer-related trauma. This report describes our experience in the successful diagnosis and treatment of iliopsoas injury in 40 professional soccer players. These injuries were not associated with direct external trauma to the muscle. Anatomical and functional characteristics of the iliopsoas are reviewed as they relate to the diagnosis and to the treatment by direct local injection with corticosteroids. A safe anatomical approach to the iliopsoas below the inguinal ligament is described.