Alexander Isak has clause in Newcastle contract that could complicate Liverpool transferLiverpool’s pursuit of Newcastle striker Alexander Isak faces hurdles. A sell-on clause, granting Real Sociedad 10% of any profit above Isak’s £63m transfer fee, complicates negotiations. Newcastle rejected Liverpool’s £110m bid, valuing Isak at £150m. Isak publicly expressed his desire to leave, citing broken promises, but Newcastle insists he’s not for sale unless their conditions are met.