Chelsea and Sevilla are still locked in talks for Jules Kounde.
The French centre-back is a key target for the English giants.
According to 90Min, Sevilla want more money if Chelsea are to pay a fee for Kounde over several years.
The Spanish side originally wanted his £68 million release clause paid in full.
However, Chelsea want to pay any fee in instalments, and the two clubs are now locked in talks to find a solution.
There is no suggestion whether a move is likely to conclude before the closing of the transfer window at the end of August.
