Arsenal have agreed an £8m deal with Chelsea to sign defender David Luiz on a two-year contract.
The 32-year-old Brazil international, signed a new two-year Chelsea deal in May, will have a medical at Arsenal on Thursday.
On Tuesday, Arsenal sold defender Laurent Koscielny to French side Bordeaux for a fee of up to 5m euros (£4.6m).
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They are also set to sign Celtic left-back Kieran Tierney for £25m.