The item was put up for auction on German ebay on Thursday by the user Sharkj1909, who claimed it was the exact piece of gum that Dortmund coach Klopp had been chewing during his side's cup semi-final win over Wolfsburg on Tuesday.
'You are bidding for the piece of gum which Jurgen Klopp spat out at full time on Tuesday,' read the description, 'A steward gave it to me after I spoke to him – a must for every fan and lover of BVB.'
In just one afternoon, 67 Dortmund fans put bids in for the hardened, white mass of 'Kaugummi', with the highest offer reaching over €150.
Though Sharkj1909 was unable to prove that his treasure was bona fide, he did have the decency to offer free postage. He was also honest about the item's condition, categorising it as a 'used product'.
Newspaper Ruhr Nachrichten also backed the legitimacy of the product, saying: 'with a bit of imagination, you can kind of see Jurgen Klopp's distinctive teeth marks in the gum'.
The auction was supposed to continue until Wednesday, but at around half past five yesterday, the auction was cancelled and then resumed with a new starting price of one euro. It has since disappeared again.
One can only assume that the seller decided such an item was in fact priceless. Never has Borussia Dortmund's club motto 'Echte Liebe' ('True Love') seemed so pertinent.