Forward Alexis Sanchez has been left out of Arsenal’s Premier League match at Bournemouth on Sunday.
The Chile international did not travel with the squad to the south coast, BBC Sport understands.
The 29-year-old is out of contract in the summer and has been linked with a January move to Manchester City.
However, the league leaders are unwilling to match the Gunners’ £35m asking price and there is speculation rivals Manchester United may move in.
Liverpool and Paris St-Germain have also been linked with Sanchez, but the player’s preference is to join City.
"Normally he would stay until the end of the season – but we’ll see," said Gunners boss Arsene Wenger on Friday.
"Nothing is really concrete at the moment and nothing is decided one way or another. Of course, I want a quick resolution."
It is understood Arsenal’s hierarchy have accepted that Sanchez is likely to depart after three and a half years at Emirates Stadium.
However, the Gunners are reluctant to sell without replacing him and their first choice is Bordeaux’s 20-year-old Brazilian forward Malcom.
If a deal cannot be agreed with any club, Sanchez will be able to leave when his contract expires in the summer – a situation Arsenal are keen to avoid as they would receive nothing.