Fulham have submitted a £20million offer for Crystal Palace defender Joachim Andersen.
Palace are seeking a fee more in the region of £40m and talks between the clubs continue.
Fulham are in the market to strengthen their centre-back options this summer following the departure of Tosin Adarabioyo to Chelsea.
The Athletic reported on Friday Fulham had seen an opening bid for Aston Villa defender Diego Carlos rejected, with no subsequent contact to date.
Tim Ream also left for Charlotte FC, while Fulham confirmed the €6.3million signing of Villarreal central defender Jorge Cuenca this month.