Michallik became a U.S. citizen on March 8, 1991. U.S. coach
Bora Milutinovic quickly called him into the national team. That year, he was part of the team which won the 1991
CONCACAF championship. In August 1991, he signed a contract to play exclusively for the national team. In 1992, he tasted victory again when the U.S. team won that year's U.S. Cup. He went on to earn 44
caps and score a single goal as a tough defender. He was key to the U.S. preparation for the
1994 World Cup, playing in 12 pre-tournament games and starting in seven. As hosts of the 1994 World Cup, the United States qualified automatically, thus not having to qualify through the CONCACAF region's
qualification tournament, and he was frequently summoned for friendlies, which he scored his first and only international goal for the United States in a 2–0 away triumph over
Saudi Arabia in
Riyadh. However, he was left off the roster for the tournament itself and retired from the national team later that year. ;International goals
Futsal In 1995, Michallik earned five caps and scored 1 goal with the U.S.
futsal team. ==Life after retirement==