However, it seems that in private the veteran gaffer made an attempt to stop the 24-year-old jumping ship.
"Ross was the most painful [departure]," said Moshiri.
"I said last year we had three stars, Ross, Romelu [Lukaku] and John Stones but they’ve all gone.
"For sixth months we couldn’t find the agent [of Ross].
GETTY
Everton boss Sam Allardyce tried to convince Chelsea new boy Ross Barkley to stay at Goodison Park
"Bill [Kenwright] miraculously got an offer of £35m for a player who was going to be a free agent but he didn’t want to go when he was injured.
"Sam spoke to him but he wouldn’t stay."
Allardyce opened up on Barkley’s exit while reflecting on why Everton sold Romelu Lukaku without securing a replacement.
"I’ve been at seven Premier League clubs," he said.
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Ross Barkley gets stuck into new training regime at Chelsea
"You can’t let a player with two years left on his contract - who will refuse to sign a new deal - to stay on.
"You must cash in. As we’ve seen with Ross Barkley.
"You had to maximise the value of that player by letting him go down to 18 months of his contract."
Barkley won't come up against Everton this season as they've already faced Chelsea twice in the Premier League are out of the FA Cup.