Keegan played for Scunthorpe United before being signed by Liverpool.

Keegan won three First Division titles, the UEFA Cup twice, the FA Cup, and the European Cup with Liverpool.

Keegan moved to Hamburg and was named European Footballer of the Year in 1978 and 1979. Hamburg won the Bundesliga title in the 1978–79 season.

Keegan played for Southampton, scoring 30 goals in all competitions in his second season and winning the golden boot.

Keegan helped Newcastle secure promotion in his second season before retiring in 1984.