Sunderland scored two goals in the last 15 minutes to win 2-1, securing a spot in the Premier League for the upcoming season. This meant that Wilder's team was unable to advance to the top league.
Former Hull City manager Selles, who is 42 years old, has signed a three-year contract with Sheffield United. He brings experience from the Premier League and Championship to the role.
The club's official statement said, "We are pleased to have appointed a new manager with a strong background in football. Ruben Selles will lead the team at Bramall Lane, and we look forward to seeing his vision for the club come to life."
The club also mentioned that further coaching appointments will be made in the coming days.