"He's 17, playing week in, week out, and he is absolutely unbelievable - Josh Wynder, who plays for Louisville."
Within the last few days, Sky Sports News has learned there has been significant interest in Wynder from two of the biggest clubs in Portugal.
"I've spoken to some of the top teams in England and Europe about him, and they're watching him. And his club are getting inundated with calls," says Cartwright.
"The talent pool here is incredible. The Americans tend to breed athletic, agile players with great temperaments.
"It's just getting them at 17, 18, 19 understanding the game so that they can take that next step and go and play in Europe. Everything they watch on TV now is the Premier League, the Bundesliga, Ligue 1 - they want to go and play in Europe."