Arsenal sign Tierney, agree £8m deal for David Luiz
Arsenal have signed Scotland left-back Kieran Tierney for £25m and are set to bring in defender David Luiz from Chelsea for £8m on a two-year contract.
Brazil centre-back Luiz, who signed a new two-year Chelsea deal in May, will have a medical at Arsenal on Thursday.
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Tierney, 22, has joined the club from Celtic on a long-term contract.
"We're delighted Kieran is joining us. He's a very talented player who will continue to improve," said Gunners boss Unai Emery.
"He increases our options defensively and I look forward to him joining our group."
Luiz, 32, has spent six and a half years at Chelsea during two spells and has made 160 Premier League appearances, scoring 11 goals.
His departure, if confirmed, comes five weeks after Frank Lampard returned to Stamford Bridge to manage his former club.
On Tuesday, Arsenal sold defender Laurent Koscielny to French side Bordeaux for a fee of up to 5m euros (£4.6m).