An agreement in principle has been reached for Cucurella to join the Blues, but a deal for the left-back is still being worked out.
Sky Sports News has been told a deal has been agreed to.
A deal has not been reached, according to the Seagulls. It'sComplicated by the Seagulls pursuit of Levi Colwill.
Sky Sports News chief reporter Kaveh Solhekol said that "Brighton have said as far as they're concerned this deal isn't agreed with anyone yet."
Many people involved in the negotiations and the deal are telling us that a deal has been agreed in principle and that the player wants to join the Blues. As far as they're concerned, he's going to be a member of the Blues and a medical has been booked.
If they are saying the deal hasn't been done yet, no matter what we are told by other sources, the deal has not been completed yet.
It could be complicated because of the interest in signing Levi Colwill. I don't believe that deal is going to be involved in the Cucurella deal, but those are negotiations going on in parallel.
The player is confident that he's going to become a Blues player, according to multiple sources.
The Spaniard handed in a transfer request on Friday in a bid to push through a move to Manchester City but the premier league champions did not want to pay the asking price for the 24 year old.
The Seagulls had previously turned down a £30m bid for the full-back from the club.
Cucurella was named Seagulls' player of the season after he moved from Getafe in a deal worth around 15 million dollars.
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Cucurella had four years left on his contract at the Amex when he was sold by the Seagulls.
With doubts surrounding the future of left-back Marcos Alonso, Barcelona are said to be interested in signing him this summer. Cesar Azpilicueta has one year left on his contract and the Spanish giants want him.
Ben Chilwell missed the majority of last season with a knee injury but has returned to full fitness.
The side has made two signings this summer, the first being the signing of Manchester City's Raheem Sterling for over fifty million dollars and the second being the signing of Kalidou Koulibaly for over thirty million dollars.
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The transfer window will close at 11pm on September 1st.
Sky Sports has a dedicated Transfer Centre website where you can keep up-to-date with all the latest news. Sky Sports News gives you the ins, outs and analysis of sports.