He could switch. If he makes one more competitive appearance he can't, but he won't switch.
He is just injured.
September 2020, the 70th edition of the
FIFA Congress approved a rule change that now allows players to switch if they have
played no more than three competitive matches at senior level prior to them turning 21 including no appearances in
FIFA World Cup finals matches or continental finals (e.g. the
UEFA European Championship). However, appearing in a tournament qualifier would not.
[31][32][33][34] Furthermore, players who played for their home country but not at senior level, who were under 21 at the time and have since lived in a new country for five years or more can apply for the right to represent their new place of residence.
[35] This also applies to players that began living on the territory before the age of 10 for at least three years.
[36]
This is the national team page of Brighton & Hove Albion player Evan Ferguson. This page contains a statistic about the player's national team career.
www.transfermarkt.co.uk