Foss enters his first season with the Somerset Patriots and first in the Atlantic League. He has spent most of the previous two seasons with the Washington Wild Things in the Frontier League. There, the righty combined to go 20-8 with a 2.82 ERA and 154 strikeouts against 46 walks over 35 games (34 starts) over his two seasons, both in which he was named an All-Star. Foss also spun a franchise-record 12 complete games (including four shutouts) over his two seasons in Washington.

The Janesville, Wisconsin native parlayed an 8-3 record with a 2.50 ERA in 2016 with the Wild Things into seven starts with Single-A Lake County in the Cleveland Indians organization at the end of the season. He returned to Washington in 2017 to post a 12-5 record with a 3.06 ERA over 20 starts.

Foss spent the first three years of his professional career in the Los Angeles Angels of Anaheim organization, primarily as a relief pitcher. The Texas A&M – Corpus Christi alumnus won 16 games with a 3.75 ERA in the Angels system, including two years at High-A Inland Empire. He owns a 40-25 record with a 3.40 ERA over his five seasons of professional baseball.