The French capital's premier club has said that it had received between 700,000 and one million requests for tickets for the last-eight first leg tie at the Parc des Princes, which has a capacity of just 45,000.
As club switchboards and the ticket office went into meltdown, touts stepped in, selling black-market tickets for hundreds of euros in the vicinity of the ground.
But astronomical sums have also been recorded on Internet ticket sites.
On viagogo.com, a resale site with which PSG has a partnership, seats were on sale for between €195 and €1,200 while on the auction site eBay, the asking price ranged from €150 to €1,400.
When the club put tickets on sale to the general public, the cheapest seats were €50 and the most expensive €350.
The club's deputy director-general Frederic Longuepee had previously told Le Parisien newspaper that it was possible to cancel tickets acquired on the black market.
"They've got a number, which allows us to deactive them if it's proven that they were sold fraudulently," he said.