Luis Milla insists there are positives to take from Spain's best young talents moving to the Premier League.
Alvaro Hernandez (Real Madrid), Marc Jurado (Barcelona) and Alex Garnacho (Atletico Madrid) all moved to Old Trafford this summer. United also count on Arnau Puigmal, who was snapped up from Espanyol three years.
United have been praised for their far-reaching recruitment, but the situation has caused some anxiety in Spain.
Milla knows the Spanish youth system better than most, having managed La Roja at the U19, U20, U21 and U23 level.
And while the situation might inhibit La Liga's biggest teams, Milla believes the Spain national team can benefit from their players competing in arguably a stronger league.
He told Tribalfootball.com: "Well, it's bad for Spanish football. However, on the plus side, it is good for the Spanish players' growth to be learning another language, culture and also play in as strong a League as the Premier League is.
"In England, the conditions are better for Spanish players than they were before... as there is more money in the Premier League than in the old days and therefore the contracts are better."
Milla, who was in charge of Spain when they won the U21 European Championships in 2011, adds that it was overseas players which gave Spain an edge in their recent glory years.
"If you look at the Golden Age of Spain (the national side)from 2008 to 2012 (winning the World Cup & 2 European Championships) … by then, Spain had the advantage of having players who were playing abroad like Fabregas, Pedro and Torres.
"The experience of playing abroad gives Spanish players an advantage in international competitions that previous Spain national sides had been lacking. In the old days, Spain were dark horse favourites for some at international tournaments but rarely won titles, not for lack of talent but perhaps for lack of players with experience abroad."