The Blues officially announced the arrival of Kellyman on Saturday morning on a six-year contract until 2030 that includes the option for a further 12 months beyond that.

Chelsea are understood to have paid a fee of around PS19million for the 18-year-old midfielder, who follows the likes of Carney Chukwuemeka in making the switch from Villa Park to Stamford Bridge as a youngster.

News of Chelsea's interest in Kellyman first emerged last weekend, with the club moving quickly to get a deal over the line and the former Derby player passing a medical.

"It is fantastic to be standing here as a Chelsea player," Kellyman told Chelsea's official website. "It's a massive club with an amazing history, so it is great to join.

"It is a dream come true for sure. I'm buzzing to have put on the shirt and can't wait to get started."

The Blues are also set to clinch the signing of teenage striker Marc Guiu following a medical after triggering the modest PS5m release clause in his current Barcelona contract, while they are also closing in on a PS17m deal with Boca Juniors for 19-year-old defender Aaron Anselmino.

Meanwhile, Chelsea are on the verge of selling winger Omari Hutchinson to Ipswich in a PS22.5m deal that would represent a club-record for the newly-promoted Tractor Boys, with whom the Jamaican international flourished on loan in the Championship last season.

Moroccan winger Hakim Ziyech also completed his permanent free transfer to loan club Galatasaray on Friday.

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