Mundo Deportivo reports on Borussia Dortmund's interest in Franco Mastantuono. Borussia Dortmund is among the 17 clubs interested in Franco Mastantuono. The 17-year-old sensation from River Plate, who has been dazzling the football world with his performances under Marcelo Gallardo, has a release clause set at 45 million euros. While reports initially suggested he might be waiting for Real Madrid, it's now clear he has no current preference, setting up an intense few months to see if he will make a move to Europe this summer.