In 1966 Vasas set a record by winning the 1966 Nemzeti Bajnokság I season without any defeats. Vasas competed in the 1966–67 European Cup. On 5 October 1966 Vasas beat Sporting 5–0 at the Népstadion in front of 65,218 spectators in the first round. On 12 October 1966, Vasas beat Sporting 2–0 at the José Alvalade Stadium, Lisbon, Portugal. Vasas qualified for the second round on 7–0 aggregate. On 16 November 1966, Vasas were hosted by 1965–66 Serie A champions Internazionale. The match was won by the Italian club 2–1 at the San Siro in front of 29,207 spectators. On 8 December 1966, Vasas were beaten by Internazionale 2–0 at the Népstadion in front of 67,013 spectators. Vasas were eliminated from the 1966–67 European Cup on 4–1 aggragate.