In a short time he made his mark on the international stage. When the original choice for the 1993-94 UEFA Champions League Final, Dutchman John Blankenstein, had to withdraw, Don took charge of the game in Athens, even though he had little over two years experience at that level. In the match, Milan thrashed Barcelona 4–0. He officiated in two matches in the 1994 World Cup: the quarter-final between Sweden and Romania in Palo Alto, and the first-round game between Saudi Arabia and Morocco in New Jersey.