Essential support personnel who wants to come to the US to assist an athlete might be eligible to join them under the P-1S Visa. To be able to do it, they must prove that they are an integral part of the performance of the athlete and that their duties cannot be carried out by a US worker.
For essential support personnel to get the P-1S Visa, the US sponsor of the athlete must file a separate Form I-129 for them. The sponsor must also provide a written statement describing what the essential support personnel is responsible for and what expertise they have.
Examples of essential support personnel include coaches, referees, interpreters, or trainers.