St. Louis City SC announced the transfer of forward Nicholas Gioacchini to Italian Serie B club Como 1907 on Wednesday.
The 23-year-old U.S. international's reported $2 million fee could climb to $4 million with future incentives.
"While always difficult to see one of our top performing players move on, we understand the attractiveness of joining European football and will be immensely proud to cheer Niko on, as he fights for promotion to Serie A," St. Louis sporting director Lutz Pfannenstiel said in a release.
"He was a key member to our inaugural season's success and will always be remembered for it. We wish him and his family all the best."
Gioacchini shared the 2023 MLS expansion club's lead with 10 goals in 32 matches (24 starts) last season. He added one assist.
He joined St. Louis through the expansion draft following a brief stint at Orlando City SC (six games in 2022).
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