Liverpool reportedly took measures to ward off future interest in their players from Barcelona when allowing Philippe Coutinho to leave for Camp Nou.
At the start of 2018, Liverpool reluctantly gave permission for the Brazilian to move to the La Liga giants for a big-money fee spread over a number of years.
Since securing the playmaker's signature, the Catalan side have been linked with moves for the likes of Georginio Wijnaldum and Sadio Mane.
However, according to The Times, Barcelona would have had to pay an extra €100m (£89m) if they wanted to push through a deal.
The report claims that Liverpool inserted a clause in the Coutinho deal which protected them during future discussions over sales.
The exit of Luis Suarez in 2014 likely played a part in the stance taken by the Premier League outfit.
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