The young striker was traded to Chivas USA yesterday.
Soler told the New York Post: "We had offers from overseas for Juan for two and a half years and we didn't want to sell him. We turned down every offer from abroad. We would have done the same now. In the end, he needs to play. We have a pair of strikers that are working fantastic at the moment. To be a backup player is not good enough for Juan and we understand that. So we made a decision to let him play in the preseason, he was a starter against FC Dallas.
"He would have been a starter in the games coming up after that, but then he left for the National Team, came back with an injury and in that time, Kenny Cooper did what he did. He turned out a great player for us. I am convinced that Juan at one time will go to Europe, and of course we are ultimately in apposition to financially have a gain if that should happen. But I think that should be in a few years time from now, but I really hope he does get the chance to go to the right club."