Barkley started his professional club football career at Everton and joined Premier League rivals Chelsea in January 2018 for a transfer fee reported by BBC Sport to be worth £15 million.
The attacking midfielder struggled to make an impact at Stamford Bridge during the second half of last season, but the 24-year-old has been doing well this campaign.
The England international has scored three goals and provided three assists in 455 minutes of Premier League football so far this season, according to WhoScored.
Barkley is set to feature for Chelsea in their Premier League match against Everton at Stamford Bridge on Sunday afternoon.
Ahead of the match, Everton owner Moshiri has given his take on Barkley, and believes that the 24-year-old - who earns £90,000 per week as salary, according to Spotrac.com - is doing well at Chelsea.
Moshiri said about Barkley on the Jim White show on talkSPORT on Friday morning (11:25am, November 9, 2018): “He has been doing fine. He is an ex-academy boy, we wish him well, not necessarily on Sunday, but we wish him well.
"We follow him and like all our ex-academy boys, like Wayne (Rooney), we wish him well, and I think he is doing well.”