David Raya will reportedly join Arsenal on loan with an option to buy from Brentford.
According to the Athletic, the deal is expected to see Raya move to the Emirates for an initial £3million loan fee with the option of making the switch permanent next summer for an extra £27m.
Raya has one year remaining on his contract at the Gtech Community Stadium, which will be extended for a further 12 months to facilitate the deal.
The 27-year-old is expected to undergo his medical with the Gunners on Thursday ahead of a move that will see him provide competition for starting shot-stopper Aaron Ramsdale.