BBC Sport explores why Saudi Arabia are participating in a tournament for North and Central American countries

Non-member guests have long been a part of Concacaf's tournament, and Saudi Arabia is now the eighth invitee to have debuted in the event.

The leading goalscorer in the Gold Cup with five goals in three games, Panama’s Ismael Díaz is making sure the Nations League silver medalists are genuine contenders heading into the quarterfinals against Honduras.