Reece Oxford is to spend the coming season on loan with Borussia Monchengladbach from West Ham.
The 18-year-old, who can play in both defence and midfield, joins the Bundesliga club on July 1, having spent the second half of 2016/17 in the Championship with Reading.
"We believe Reece has a very exciting and successful future here at West Ham, and he now needs regular first team football to ensure his progress continues," West Ham manager Slaven Bilic told the club's official website.
"He will play in a league which is very technical, which can only help him immensely, and he will also learn a new culture and gain valuable life experience."
It has also been confirmed that goalkeeper Raphael Spiegel and defender Stephen Hendrie have left the club at the conclusion of their contracts.