Willian underwent a medical at Nottingham Forest on Thursday night, as talks advance over a deal for the Brazilian, though Fulham have made a rival offer.
The 34-year-old has just had a good year with the Cottagers in West London, aiding their way to a top-half finish with five goals and six assists to his credit.
However, the winger rejected Fulham's initial proposal to remain with the club for another season - and has undergone a medical in the Midlands as he weighs up his options.
He was also spotted at the training ground, as he considered the prospect of a move to the City Ground - which is thought to come with a better offer than that tabled by his former paymasters in SW6.
The Brazilian is expected to make a decision imminently, with Saudi Arabian clubs also looming with lucrative financial offers.
The former Chelsea and Arsenal player is a two-time Premier League winner with the Blues, as well as winning the UEFA Cup in 2009 with Shakhtar Donetsk and the Europa League 10 years later with Maurizio Sarri's Chelsea.
Willian earned 70 Brazil caps between 2011 and 2019, scoring nine times, most recently during their run to winning the Copa America in the last year of the 2010s.
Fulham were one of the surprise packages of the season in their first campaign back in the English top-flight, as they finished in the top half of the table. Nottingham Forest finished in 16th place, securing their status in the Premier League with a week remaining.
If he does join Nottingham Forest, he would be the club's first summer signing, after striker Chris Wood's permanent arrival from Newcastle was confirmed in February.
Forest begin the new season away to Arsenal at lunchtime on August 12, the same day Fulham kick off their campaign on the
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