Former Manchester City financial adviser Stefan Borson reckons Alexander Isak's switch to Liverpool will ultimately set them back £300 million ($406.3 million).
The Swedish striker brought a summer-long transfer saga to a close on deadline day when he was formally unveiled as a Reds player, smashing the British transfer record following three years at Newcastle.
Isak's switch to Merseyside proved controversial, with the striker downing tools to force through a move after missing the club's preseason tour of the Far East due to a minor injury. He then sat out the entire preseason programme and the opening month of the Premier League campaign.
Liverpool's new frontman is poised to make his bow for Arne Slot's team on Sunday away at newly-promoted Burnley.
The Reds will be hoping to maintain their perfect league record so far this season when they head to Turf Moor.
Borson has now offered his assessment of how much Isak's arrival at Anfield will eventually cost the Reds down the road.
"I think from Liverpool's perspective, it's a very expensive deal, but we know that," he told Football Insider.
"You don't pay £125 million ($169.3 million) and not expect a lot of cost.
"For Newcastle, they clear out £125 million net on the transaction, so that goes into their coffers. And then Liverpool, you're looking at a £125 million transfer fee.
"You have got maybe £5 million ($6.8 million) of solidarity payments.
"You have got maybe £5 million on Premier League levy. You have got agent fees. It's going to be about £150 million ($203.1 million), and then you've got probably the same again with wages over the six years, maybe another £150 million with bonuses.
"It's a £300 million deal over six years. It's a massively expensive deal, but he's also a brilliant player. Does it make sense? I don't know, you can only judge these things after the event, can't you really?
"But on the face of it, it makes sense, even though it's very expensive. It obviously won't be repeated every summer.
"This is an exceptional summer for Liverpool."