A clause in the transfer that saw Philippe Coutinho move to Barcelona has had serious repercussions for the club.
Liverpool sold the Brazil international in 2018 after a lengthy transfer saga that stretched on from the summer.
The Reds managed to fight off Barcelona but only until the following January, where he joined for a whopping £142m.
But it was not just a hefty transfer fee the two clubs agreed on.
A further clause in the contract meant that the Catalan club had to pay a premium on any other purchases from Anfield.
Liverpool have been the victim of Barca's pulling power in the past with players such as Luis Suarez and Javier Mascherano.
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And so, a premium of £89m (€100m) has been placed on any other signings from Merseyside up until the end of 2020.
There have been murmurs at the Catalan club that they would love some of the players at Liverpool.
Not least after their embarrassing mauling from them in the Champions League last season.
After winning 3-0 at the Nou Camp, they threw it away in the second leg thanks to a brace from Divock Origi.
Mane had been linked with a move to Spain in recent years and Transfermarkt value the Senegal striker at £135m.
That means that if Barca wanted to snap up the 27-year-old, it would take his value to £225m.
The Liverpool forward has been in fine form this season for the Reds as they look to land the Premier League title.
He scored the winner against West Ham on Monday night in a close 3-2 win at Anfield to make it 26 wins out of 27.
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They sit 22 points clear of Manchester City and Klopp was full of praise for his side as they fought back from 2-1 down to beat the Hammers.
He said: "I liked a lot how we started. We scored a wonderful first goal. But then we weren't good in second ball situations.
"We have to pick them up much more often. We struggled in this situation and that gave West Ham a good feeling."
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