Romelu Lukaku is a target for Chelsea and Manchester United
Palmeri is a renowned transfer guru who has worked for a variety of media outlets.
Express Sport understands Lukaku is a genuine target for Chelsea, while Manchester United want him too.
But Palmeri, who has 142,000 Twitter followers on his verified account, has gone as far to say as the deal is already far down the line.
He tweeted this morning: “Chelsea have reached an agreement on principles with Lukaku. Still under negotiations the fee with Everton.”
Palmeri was subsequently asked if Chelsea would pay £100m to bring Lukaku back to Stamford Bridge.
Romelu Lukaku didn't get many chances after signing for Chelsea as a teenager
He replied: “Don't think so. Doesn't look like an easy negotiation. Lukaku though could force it.”
Lukaku joined Chelsea as an 18-year-old in 2011 after making the move from Anderlecht for £10m.
He is represented by Mino Raiola, the man who did a world-record deal to take Paul Pogba to United last summer.
The Belgian striker seems to have made a decision on his future – although he is yet to reveal it publicly.
"My agent knows what's going to happen," the 24-year-old told Sky Sports.
"I know what I want to do, and whenever something happens, you guys will know."
Romelu Lukaku transfer odds: Where next for the Everton star? Tue, June 6, 2017
Where could Everton ace Romelu Lukaku go next, according to Skybet odds?
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Arsenal – 33/1
His agent Mino Raiola recently confirmed Everton will allow him to leave if they receive the right offer.
"Lukaku had a promise that if certain clubs came this summer that he could leave this summer," Raiola told talkSPORT.
"We are not in concrete talks with anybody at this moment, but hearing the market I think some clubs will contact Everton.
"If the price is right for Everton and the project is right for Lukaku then I think he will want to make another step, but we are not there yet."
Lukaku, who scored 26 goals in all competitions for Everton last season, is under contract with the Merseyside outfit until 2019.