The bustling Alsop was regarded as a prospect for the future by manager James Mcintyre, but the latter's departure and replacement by Harry Storer, changed Alsop's career.
Storer brought in the striking partners Clarrie Bourton and Jock Lauderdale and the 20 year old Alsop was sold to Walsall. He hit the headlines, scoring the first of the 2 goals for the Saddlers team that sensationally knocked Arsenal from the F.A. Cup in 1933. He was a prolific scorer, scoring 125 League goals in only 159 League games for the Fellows Park club.
He moved to First Division WBA, but moved onto Southern League Ipswich Town after only 1 League game. He helped Ipswich achieve League status before returning to Walsall, where he finished his career. During the war he guested for Leicester City, Luton Town, Mansfield Town and North-ampton. In all football, he scored 297 goals in his 18 year career. Alsop has the distinction of having a stand named after him at the Bescot Stadium, the new home of Walsall.