Academy coaches Mark Robson, Steve Potts, Gerard Prenderville and Billy Lepine have been given permanent first-team positions by Nuno.
Robson, Potts and Prenderville join the first team coaching staff, with Lepine now goalkeeper coach.
Nuno stated: "I am very happy that Mark, Steve, Gerard and Billy have agreed to continue in their positions permanently. They are a great asset: people who, beyond their knowledge and effort, feel for West Ham United. This is key to the challenge we are currently facing.
"I've been very impressed by their work, their knowledge and their commitment to West Ham United. They know the Club, the players and the people here very well, and that's a great strength for us going forward.
"Everyone has been very supportive during these first two weeks; they immediately understood what I'm trying to implement, and we already have a good relationship. Every day we learn more and work harder to get closer to the team we want to become."