Arsenal manager Arsene Wenger suspects Spanish midfielder Cesc Fabregas may return to the Gunners one day.
Fabregas traded Barcelona for Arsenal when he was 16 and went on to make over 200 appearances for the north Londoners before re-signing with his home town club in 2011.
"I'm not convinced that he won't come back here one day," Wenger is quoted as saying in the Guardian.
"He is really an Arsenal man. He loves Arsenal and watches every game of Arsenal.
"But of course Barcelona was his home town where he grew up and you have to accept that will come into it, especially with them having the best team in the world.
"[Fabregas would not come back] in the next two, three years, certainly not, because he is linked with Barcelona. But maybe later."
Wenger admits players of Fabregas's quality are rare.
"Fabregas is an exception that I would try again, a world-class player you don't easily find," said the Frenchman.