Barcelona have reportedly had a fresh offer for Willian rejected after renewing their interest in the Chelsea forward.
The Catalan giants had a number of offers knocked back for the Brazil international during the summer transfer window.
Barca admitted defeat last July and turned to Malcom in a £38m deal, but the marquee summer signing has failed to impress and Ernesto Valverde is said to be keen to bring in another wide player.
According to The Telegraph, Barcelona approached Chelsea on Thursday and offered Malcom plus cash for Willian, valuing the 30-year-old at £50m.
Chelsea believe that the former Shakhtar Donetsk ace is worth more, though, and they are unwilling to do business this month.
Willian has two goals and three assists in 20 Premier League appearances this season, compared to no goals and assists for Malcom in five La Liga outings.