[2] Walsh began his career playing non-league football before joining Arsenal as an amateur in March 1949 before signing professional for the club five months later.
He returned to Highbury in 1952 and played regularly for the reserve side before making his debut on 26 September 1953 against Cardiff City.
He went on to make just seventeen league appearances for the club before leaving as part of a deal which saw Cardiff City players Mike Tiddy and Gordon Nutt move to London and Walsh move the other way to Ninian Park.
He helped the club to two Welsh Cup's, including scoring twice against Cardiff's archrivals Swansea City in a South Wales derby final which ended 3–2 to the Bluebirds.
In November 1961 he left Cardiff for £2,000 to sign for Newport County and spent two years at Somerton Park before retiring.