Reyna has featured 10 times for the Bundesliga side this season but suffered an absence through the end of November due to a groin strain that had him sidelined due to injury. This campaign, he has scored twice for Nuri Sahin's side, while also putting forth a valiant performance against Barcelona in the Champions League. However, playing time has been difficult to come by, with the American only starting twice for the manager.
Reyna has been with BVB since 2019 and was loaned out to Premier League side Nottingham Forest last January during the second half of the 2023/24 season. At Forest, he made 10 appearances, scoring zero goals. Since signing for Dortmund, he's scored 19 goals in 131 appearances for the Bundesliga side.
At Milan, he could reunite with fellow U.S. internationals Christian Pulisic and Yunus Musah, who are both featuring in Italy with the Serie A club at the moment.