Known substitutes

Known substitutes are trusted people who are not on the roster and whom you summon match by match.

How to add one

Open My Teams, pick the team and tap Known substitutes.
Tap Add substitute. Invite known substitutes opens, with its own link and its own message.
Share the link with Share on WhatsApp, Telegram or Email, or tap the copy icon next to the link.

Tap the person in the list and choose:

Make official player: they join the roster as a starter and get every match. If a match is already organized, you still have to summon them for that one. When the roster is full, the app explains that a place must open first and the person stays a known substitute.
Remove from substitutes: the app asks for a reason and they stop being summoned.

A Manager can add and share, but not do these two things.

Everyone on the roster can open the Known substitutes list, but only the President and Managers can add someone.
The link is valid for 24 hours and works for one person only. Generate new link does not cancel earlier unused ones, so make one link per person.
The person sees their own view of the team, shown as “On the bench”. If they want out, they can leave the team.
The roster holds up to 30 people: the President, Managers, starters and substitutes. Known substitutes do not take up roster places, and this link still works at 30 people.
At 30 people, someone opening a starter invitation sees that the roster is full and cannot join. Generating another starter link does not create a place.
On Invite players the screen tells you when the roster is full. There you can still share or copy the link, generate links and edit the message. The known-substitute invitation does not show that notice.
A roster member leaving, or being removed by the President, opens a place. The invitee can open the same starter link again while it is still valid, or the President can try Make official player again. Removing a known substitute does not open a place. Transferring the presidency does not either if the person remains on the roster.
There is no waiting list or notification when a place opens. Someone who wants a roster place checks with the President or a Manager.
After the link is copied successfully, the copy button shows a check briefly, then returns to its resting state.

If the app can’t do what you asked, it tells you. Try again in a few minutes.