Neymar's record-breaking transfer from Barcelona to Paris Saint-Germain has left Roma sporting director Monchi feeling "afraid" over the future of football.
The 25-year-old's €222million switch was completed on Thursday and on Friday he was presented to the world's media at the Parc des Princes.
It marks a drastic escalation in the highest fee paid for a player, more than doubling the €105m that Manchester United paid for Paul Pogba last August.
And Monchi raised concerns over the viability of such a trend continuing.
"I feel a bit uneasy and afraid. I don't know where we're headed," he told Roma's official website.
"I don't want to think that we're creating a speculative bubble which will one day burst.
"I've shown clearly in the past that I don't buy very expensive players.
How much have PSG spent since 2011?
"It's not up to me to say whether or not it's above board. It's hard to fathom so much money being spent at a time when elsewhere there are lots of people struggling to make ends meet."
In a damning statement also released on Friday, FIFPro general secretary Theo van Seggelen blasted FIFA's transfer rules, which he described as "anti-competitive, unjustified and illegal".