[7] In late December 1966, the ECPSL merged with the National Soccer League with their remaining active clubs Hamilton Primos, and Toronto Inter-Roma joining the Ontario-based circuit.
[10] Several reforms were presented at the annual owners meeting with the proposal of a promotion and relegation system, and a partitioning of the league into two separate divisions.
[10] The league also received an inquiry from American interests in attempts of acquiring an NSL franchise.
[11] The dispute centered around the usage of Carlos Metidieri, and Jorge Piotti, as both were signed to Boston Rovers of the United Soccer Association, and failed to receive permission from the Canadian Soccer Football Association in the usage of these contracted players.
[24][25] Windsor and Hamilton finished as their respective group champions, and as a result, qualified for the O’Keefe Trophy final.