The Dutch coach does not believe escalating transfer fees will stop at the €222 million that PSG paid for Neymar
Borussia Dortmund head coach Peter Bosz expects the €1 billion mark to be reached in the transfer market before too long.
The most recent transfer window saw Paris Saint-Germain smash the world record by paying €222 million to bring Neymar to Ligue 1 from Barcelona.
The Catalans replaced the Brazil star with Dortmund's Ousmane Dembele, who became the second most expensive player in history after completing a move for an initial €105million.
Spending has escalated since Cristiano Ronaldo's move to Real Madrid ...