 By 1961, age meant Barnes was no longer an automatic first team selection, so he sought a move into management. An opportunity arose at Wrexham in May 1961, and Barnes was appointed player-manager. In his first season the club gained promotion to the Third Division. During his tenure he oversaw the club's record victory, a 10 – 1 defeat of Hartlepool United. The club finished ninth in 1962 – 63, but were relegated to the Fourth Division the following season. Barnes remained at the club until 1965, when he resigned his post. By the time of his departure from the club he had made 132 appearances, scoring 24 goals.
