The England international, 23, has refused to put pen to paper on a fresh deal which would extend his Goodison Park stay beyond next summer.
And since signing Davy Klaassen from Ajax to replace the midfielder, Ronald Koeman has revealed he is set to be sold.
Tottenham manager Mauricio Pochettino has been heavily linked with a move to sign Barkley and further strengthen the English core of his squad.
Chelsea, Manchester United and Arsenal, meanwhile, are thought to be keeping tabs on him but are unwilling to meet Everton’s £50m valuation.
Barkley might swap Merseyside for Tyneside based on Betfair’s latest odds though.
Today they’ve slashed the chances of Barkley signing for Newcastle by September 1 from 50/1 to 6/1.
That huge drop is reflected at William Hill, who’ve priced the Magpies at 4/1 to be his next club.
Both bookies have Tottenham as favourites to secure Barkley’s services though.
While Betfair have Chelsea at 3/1 and Arsenal at 7/2 - both shorter odds than Newcastle.
Despite Koeman’s admission, Barkley is 9/1 to stay with Everton beyond the end of the transfer window.
Starsport reached out to Betfair to get an explanation for the sudden shortening of Barkley’s odds to join Newcastle.
And a spokesperson revealed a number of big bets on the potential switch had caused the change.
