Charlton midfielder Jonjo Shelvey was undergoing a medical at Liverpool on Tuesday after the two teams agreed a fee for a transfer.
The Addicks confirmed on their website the clubs had agreed an initial fee of £1.7million for the 18-year-old, who travelled to Merseyside on Tuesday for talks and a medical.
A statement on Charlton's official website said: "As part of the potential transfer, the two clubs are also in talks to develop a strategic partnership involving the development of players in both directions."
The results of the medical will be known on Wednesday.
Shelvey holds the record as Charlton's youngest ever player, having made his debut in April 2008 at the age of 16 years and 59 days.
The England youth international has scored eight goals in 48 games for the Addicks.
Charlton chairman Richard Murray revealed earlier on Tuesday that there had been interest in the player but claimed they were "some way off doing a deal".
Big-money moves are likely to be at a premium at Anfield this summer with uncertainty surrounding the future of both the club's owners and manager Rafa Benitez, who has been linked with a move to Juventus.
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