Who are the USMNT's brightest U21 prospects bound for Europe?

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The $15 million transfer of Zavier Gozo from Real Salt Lake to Crystal Palace marked another step forward in terms of U.S. players heading to Europe. Though MLS academy products have been heading overseas for more than a decade now, the demand -- and cost in transfer fees -- is increasing.

When a then-19-year-old Tyler Adams moved from Red Bull New York to RB Leipzig in late 2018, the transfer fee, according to Transfermarkt, was a mere $5 million, although one suspected there was a "satellite club discount" given that both teams are under the Red Bull umbrella. Gozo's fee tripled that amount. (The transfer of Australia international Lucas Herrington from the Colorado Rapids to Hull City earned even more -- $18 million.)

The increases make sense. The ensuing years have seen youth team methodologies and depth of overseas contacts continuing to mature. The change in calendar, and its full alignment with the various European transfer windows, is expected to lead to even more deals getting done.

All of this leads to thoughts of who from the U.S. pool might be next to take the plunge overseas. For the purposes of this exercise, only players age 21 and under are being considered. Even with that restriction, the list of candidates is still impressive.

Cavan Sullivan | Midfielder | 16 | Philadelphia Union

Yes, I'm cheating a bit on this one, as Sullivan has already agreed to move to Manchester City after he turns 18 in September 2027. That deal, which included signing as a homegrown player with the Union, was consummated little more than two years ago, when Sullivan was 14. Such a signing at that age always elicits concern about too much, too soon, and the difficulty of forecasting how prospects will develop. Would Sullivan actually turn into a player that Man City would want?

For now, Sullivan has confirmed that he belongs on the field with professional players, albeit at the MLS level. In 1,205 minutes of play in all competitions, he has scored three goals and recorded six assists. According to TruMedia, Sullivan's successful take-on percentage is 51.6% in all competitions, a full 10 points above the league and tournament average.

There's also a feistiness about him, as witnessed by his set-to with Inter Miami's Yannick Bright, which resulted in Sullivan receiving a red card that was later rescinded. Whether Sullivan moves straight to Manchester City is an open question. Some time out on loan seems to be a more logical step, but with each passing week, Sullivan is looking increasingly like an impact player.

Julian Hall | Forward | 18 | Red Bull New York

Eyebrows were raised when Hall was preferred over veteran forward Eric Maxim Choupo-Moting to start the season, but after scoring 12 goals and adding four assists in all competitions, the 18-year-old has repaid manager Michael Bradley's faith. Hall's movement and awareness of space in the penalty area make him a classic "fox in the box," but he has proved to be adept with his link play as well.

Hall's effectiveness in front of goal has cooled off a bit of late, with only one goal contribution since league play resumed following the World Cup. That will test his ability to ride the highs and lows that every striker experiences. But his overall level of play has been such that clubs overseas are taking notice, with RB Leipzig and Atlético Madrid reportedly among those expressing interest.

The fact that Hall has Polish citizenship should make a move easier. Is another satellite club discount in the offing? Given how the previous deal with Adams worked out, and the interest from other clubs, Leipzig might need to up the ante.

Peyton Miller | Midfielder | 18 | New England Revolution

Tuning into Sunday's 1-1 draw between the Revs and New York City FC showed why European scouts are showing increasing interest in Miller. He has electric pace, and clocked the second-fastest top speed in the league this season at 36.9 km/h. Miller delivers a dangerous ball into the box and can also strike at goal. On this day, it added up to winning a penalty (which was taken by Carles Gil and subsequently saved by Matt Freese) and an assist on Dor Turgeman's 36th-minute opener.

The display was indicative of what Miller has shown all season, as he now has four goals and three assists in league play. He also has shown some versatility, lining up at left back at times in addition to playing farther upfield, even on the right.

Revs sporting director Chris Tierney recently said that Miller has received interest from clubs "around the globe" with reports linking him to multiple Premier League teams. But Miller recently signed a contract extension through 2029-30, so any European sides will have to pony up to secure his services. His impulse seems to remain in New England for now, but time will reveal how long he stays with the Revs.

Adri Mehmeti | Midfielder | 17 | Red Bull New York

Few 17-year-olds are asked to run a team's midfield. Even fewer possess the kind of vision needed to deliver line-breaking passes. But Mehmeti checks both boxes and has been ever-present in the Red Bulls' midfield this season. Last weekend, one of his through balls took out both Chicago Fire center backs to create an opening for Ronald Donkor. It's the kind of play that makes you go, "Wow."

Mehmeti also has been delivering on defense with his 125 ball recoveries ranking second among MLS midfielders, and his 38 interceptions ranking third.

But the biggest surprise of all this season has been Mehmeti's leadership, whether it's directing other players on the field or drawing teammates into the game with his positioning. He remains engaged even when things aren't going well. That part of Mehmeti's game will blossom even more with additional experience.

Neil Pierre | Defender | 18 | Philadelphia Union

There was more than just a temptation to put Pierre's teammate, right back Frankie Westfield, in this spot. But such are Pierre's physical gifts, not to mention the progress he has made in the past eight months, that he could be the next teenager to make a big-money move.

Five of those months were spent at Danish side Lyngby Boldklub, where he scored four goals and helped the team reach promotion to the Danish top flight. Since returning to Philadelphia and after the World Cup break, he has become a mainstay on the Union back line, making eight appearances in all competitions and scoring three goals.

The first thing about Pierre that catches the eye is his 6-foot-7 frame, allowing him to win a whopping 75.6% of his aerial duels in all competitions. But he also has proved adept on the ball and is an absolute menace on set pieces.

Sources tell ESPN that thanks to Pierre's exploits on both sides of the Atlantic, teams in the Netherlands have already been inquiring about the player's availability, and the expectation within Union circles is that the defender will be transferred by the end of the 2027 sprint season next May.

The record fee for a Union player was $14 million when Brenden Aaronson was transferred to RB Salzburg in 2020, which included a future fee when he moved to Leeds United in July 2022. The hope for Philly is that Pierre will eclipse that mark.