Chris Richards is uncertain for the US in World Cup and will miss Senegal friendly

Chris Richards' World Cup status remains uncertain after he tore two ligaments in his left ankle playing for Crystal Palace on May 17. The 26-year-old defender arrived at the U.S. training camp Friday and is being assessed by the medical and performance staff, with coach Mauricio Pochettino saying the next days will be crucial to determine readiness.

A 26-man roster must be submitted to FIFA by June 1, and injuries can be replaced until June 11. Richards is considered the best American center back, and substitutes could include Tim Ream, Auston Trusty, Mark McKenzie and Miles Robinson.