Arfsten has become the third USMNT player in the Middlesbrough squad, all of whom have ties to Columbus.
Morris joined the club in 2024 and has become one of Boro's most important pieces, helping lead the team to the promotion playoff last season. They ultimately fell short in the final, ensuring their stay in the Championship this season.
To continue their pursuit of a Premier League spot, the club recently went out and signed Berhalter from the Vancouver Whitecaps. Berhalter's deal was set to expire in the winter, but Boro were able to secure his services this summer for a fee of around $2 million.
“Aidan especially has been telling me about the style of play, the culture of the club and the fanbase here," Arfsten said. “Having both Aidan and Seb here will make the transition easier, because it’s always a big deal signing for a new club.
“I’m just excited to have a new challenge, and I’m looking forward to getting going.”