United States defender Polster joins Scottish club Rangers
The 25-year-old Polster has signed a 2½-year deal with the Glasgow club, which is managed by former England captain Steven Gerrard.
Polster made his debut for the United States in a 0-0 draw against Bosnia-Herzegovina in January 2018. It is his only appearance so far for the national team.
Polster is the latest American to play for Rangers after DaMarcus Beasley, Carlos Bocanegra, Maurice Edu and Claudio Reyna.