Chelsea goalkeeper Thibaut Courtois failed to report for training on Monday as doubts over his future at Stamford Bridge intensified.
Press Association Sport understands Courtois was absent from the Blues' Cobham training base despite being due to make his return from a summer break.
The 26-year-old, who has been heavily linked with a move to Real Madrid, was handed an extended holiday after helping Belgium finish third at the World Cup and has reportedly told new Chelsea boss Maurizio Sarri he wants to leave.
Courtois' Belgian teammate Eden Hazard is also being linked with a move away from Chelsea but Willian insists he is happy at the club despite revealing Barcelona made an approach for his services.
"I'm a Chelsea player," Willian told ESPN Brasil.
"I always made it clear that what I wanted was to stay in the club. The only club I knew that really made an official offer for me was Barcelona.
"But I have my head here and I intend to continue in the club unless the club wants to sell me. But my head is here in the club."
On what could be a frenetic final few days of the window at Stamford Bridge, Atletico Madrid's Jan Oblak and Jack Butland of Stoke are the two goalkeepers being touted as successors to Courtois.
Manchester United continue to be linked with a move for a central defender, with Tottenham's Toby Alderweireld, Harry Maguire of Leicester and Bayern Munich's Jerome Boateng all linked with the Old Trafford club.
Paul Pogba's agent Mino Raiola is reported to be lining up a move for the United midfielder, with Barcelona and Juventus among the destinations mentioned in dispatches.
Everton are reported to have won the race to sign Brazil international Bernard after interest from Inter Milan and West Ham, and it has also been suggested the Toffees have reached an agreement for Barcelona centre-back Yerry Mina.
Elsewhere, Newcastle announced the season-long loan signing of striker Salomon Rondon from West Brom.
The club's official statement labelled the Venezuela international as Rafael Benitez's "number one transfer target" after he joined in a move which saw Dwight Gayle move the other way for the campaign.
BBC Sport reported later on Monday that Wolves, promoted as Championship winners last season, are close to breaking their transfer record to land Middlesbrough winger Adama Traore.
The decision to bring the deadline forward so that no new signings can be added after the Premier League season begins, plus the World Cup, means the final days of the window could be frantic.