Paxten Aaronson will join Eintracht Frankfurt. (Kyle Ross-USA TODAY Sports)

Paxten Aaronson is joining his brother Brenden in Europe.

The Philadelphia Union Thursday announced the MLS team had reached a transfer agreement with Eintracht Frankfurt (Bundesliga) for the Homegrown midfielder.

Brenden plays for Leeds United in the English Premier League and will perform for the United States in the World Cup in Qatar.

The deal, which is the Union’s fourth Homegrown European transfer, includes a multi-million-dollar transfer fee, as well as additional performance-based bonuses. The Union will also retain a percentage of any future transfer fees for Aaronson.

A local product from Medford, N.J., Aaronson first played for Union Juniors and remained with the Philadelphia Union Academy throughout his youth. He signed a Homegrown Player deal on August 19, 2020, that saw him join the first team ahead of the 2021 season.

“Paxten has accomplished so much in a short amount of time. He has worked incredibly hard, and he has taken advantage of every opportunity with the first team, Union II and the U-20 national team,” Union sporting director Ernst Tanner said in a statement. “There has been interest in him for a long time, and we feel this is the right move for the club and the player, putting him in a good situation to continue developing in one the best leagues in the world. It is another great example of our development philosophy, and we are very proud of Paxten and wish him all the best at Frankfurt.”

Aaronson made his debut for the first team as a substitute in a 3-0 victory over Portland on May 30, 2021. In his first start for the club, he scored the only goal against New England on Aug. 8, 2021. In his two seasons with the club, he recorded four goals in 37 matches, seven of which he started.

He has made 10 appearances for the U-20 national team. This past year, his performance at the Concacaf U-20 Championship helped the Americans return to the U-20 World Cup, as well as the Olympics for the first time since 2008. Aaronson returned from the tournament as the Golden Boot winner with seven goals, and the Golden Ball winner, as the top player.