But HITC Sport understands that Derby County also want the left back.
Fox was the subject of several bids from Sheffield Wednesday during the summer transfer window.
The Owls were desperate to add to their left-back options but could not tempt Charlton into selling.
All the latest transfer news involving West Ham United...
West Ham United look for cover for the injured Aaron Cresswell.
The Leeds left-back comes out on top of Morgan Fox and Aaron Cresswell.
Players from Charlton Athletic, Leeds United and West Ham United all feature.
Aston Villa and Newcastle are reportedly amongst the clubs targeting Charlton defender Morgan Fox.
HITC Sport understands that a number of top-flight clubs are closely monitoring the 21-year-old full-back.
Aston Villa, West Ham United and Newcastle United are all reportedly trying to sign Charlton Athletic defender Morgan Fox.