He also made nine appearances for England in the semi-official wartime matches, scoring twelve goals.
With his playing days over, Welsh started his managerial career at Brighton & Hove Albion in November 1947 aged 36 years old.
His managerial career did not start well – Brighton finished bottom of the Third Division (South) at the end of the 1947–48 season.
Following this he joined Liverpool as manager on 5 March 1951 as a result of George Kay's decision to step down through ill-health.
After leaving Liverpool, Welsh became a publican for a while in the West Country before the lure of football brought him back into club management again, this time at Bournemouth & Boscombe Athletic in the newly formed and non-regional Third Division just before the start of the 1958–59 season.
He left the LCC to manage non-League Wycombe Wanderers between July 1962 and December 1964[3] before returning to the club where he had enjoyed such success as a player, Charlton Athletic, to become a member of their administrative staff.