You must be under 18 on July 1st of this year to register as a Youth Extra Player.
Purchase this item if you wish to be a Named Youth Extra Player on a team. Being a Named player gives you the ability to play any position on the team, without restriction on the number of times you play. You must meet the age eligibility criteria (under 18 on July 1st). In order to be an Extra Player the team MUST already have four regular players registered on it.