Barcelona have reportedly offered Willian a three-year contract as they attempt to sign the Chelsea attacker on a free transfer ahead of the 2020-21 campaign.
The Brazil international's current deal at Stamford Bridge is due to expire in August and as it stands, he will be leaving Frank Lampard's side at the end of the current season.
A number of clubs have been linked with the 31-year-old, who is expected to make a final decision on his future following Saturday's FA Cup final against Arsenal.
According to Sky Sports News, Chelsea have offered the attacker a new deal, but Barca have placed a three-year proposal on the table as they bid to tempt him to La Liga.
The report, meanwhile, claims that David Beckham-owned Inter Miami have also offered the South American a lucrative contract to make the move to the MLS.
Willian has scored 11 times and registered nine assists in 47 appearances for the Blues this term.