Speaking on Thursday, Everton manager Sam Allardyce admitted that his club were braced to receive further offers from "some of the big boys" for Barkley and conceded that his departure from Goodison Park is inevitable.
Barring any late problems, Barkley could be a Chelsea player by the end of the day, bringing an end to a 13-year stay on Merseyside that saw him make 179 first team appearances since making his debut in 2011.
The January transfer window is now open so clubs are working hard trying to strengthen their squads for the second half of the season and put deals in place for the summer.More news: Scientists urge action to save chocolate from climate change
Everton midfielder Ross Barkley is expected to have a medical at Chelsea on Friday before a £15m move to Stamford Bridge.
Barkley's current contract is set to expire at the end of the season and he has turned down the opportunity to sign a new deal so the Toffees have no choice but to sell him this month or they will lose him for free at the end of the season. "I can't see that changing".
Barkley, capped 22 times by England, has previously expressed a desire to play Champions League football and will be eligible to play for Chelsea in their last-16 clash against Barcelona in February. The two clubs agreed a £35m fee and Barkley personal terms with the Premier League champions in August, only to request more time to consider the deal as he recovered from a serious hamstring injury.