[3] Ammann would be in goal when Edmonton beat Vancouver snapping the longest winning streak in North American Professional Sports.
In the fall of 1989, Ammann became one of the first Americans to sign with a professional European club when he joined Neuchatel Xamax of the Swiss First Division in 1989 and 1990.
In the spring of 1993, the Los Angeles Salsa of the American Professional Soccer League made Ammann one of their first signings.
Ammann played in goal in the team's first international match on foreign soil losing to Alianza of El Salvador 0–1 on a penalty kick in the round of 16.
Ammann retired at the conclusion of the 1994 season after US Soccer denied the club permission to participate in the Mexican League.
The club folded after its owner (Dr. William De La Pena) pulled his financial support and purchased Athletico Celaya of Mexico.
After a four-year stint away from the college game Ammann joined Cal Poly Pomona University in spring 2017 helping them lift West Region titles and appearances in the National Final Four in back-to-back seasons (2017 and 2018).