Grayson Winter Dettoni (born June 29, 2005) is an American professional soccer player who plays as a defender for German club Darmstadt 98, on loan from Bayern Munich II.
Dettoni was born in Manassas, Virginia, United States, and started playing soccer at the age of four. He moved to California at a young age. Dettoni then moved to Germany at the age of ten after his father relocated his company to Munich, Germany.
As a youth player, Dettoni moved from San Diego Surf and joined the youth academy of German side 1860 Munich in 2015. After that, in 2017 he joined the youth academy of German Bundesliga side Bayern Munich. In 2024, he extended his contract with the club until 2026.
On August 13, 2024, Dettoni was called-up with the Bayern Munich senior team as an unused substitute for their last friendly match of the 2024âÂÂ25 pre-season, a 3âÂÂ0 win against Austrian Bundesliga club WSG Tirol.
Dettoni was called-up with the Bayern Munich senior team for a friendly match on January 6, 2025, after the 2024 winter break concluded, in which he substituted Eric Dier at the 63rd minute of a 6âÂÂ0 win over Austrian Bundesliga club Red Bull Salzburg.
On January 28, 2025, he joined Grasshopper Club Zurich of the Swiss Super League on loan for one year. On 1 August 2025, his loan was terminated early and he returned to Bayern Munich II. In his time in Zürich, he made no appearances for the Grasshopper first team and played just a handful of matches in the reserves.
On January 31, 2026, Dettoni joined 2. Bundesliga club Darmstadt 98 on a six-month loan until the end of the 2025âÂÂ26 season.
Dettoni has been called up with the United States under-19 and under-20 teams, but he is yet to make his international debut.
He mainly operates as a defender and is known for his strength, Dettoni has received comparisons to Germany international Niklas Süle.
Dettoni holds Italian passport, making him eligible to play for Italy as well as his native United States.