Former West Ham captain Kevin Nolan has returned to the club as a first-team coach.
Ex-England coach Paul Nevin has also joined the coaching staff of boss David Moyes, with both agreeing initial deals until the end of the season.
Nolan, who spent four years as a Hammers player between 2011 and 2015, started work at his old club on Thursday morning alongside Nevin and fellow coaches Alan Irvine and Xavi Valero.
West Ham manager Moyes said: "We welcome Kevin and Paul to the club.
"Both have a wealth of experience in the game and I'm sure they will make a very positive contribution.
"Kevin obviously knows the club very well having played here previously, while Paul's coaching pedigree is excellent.
Nolan made 157 appearances for West Ham and scored 31 goals, leading the club back to the Premier League in his first season at Upton Park.