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Liverpool goalkeeper Caoimhin Kelleher will have his medical at Brentford on Monday ahead of a initial £12.5m move.
Performance-related add-ons could take the eventual fee to £18m.
Meanwhile, Brentford's first-choice goalkeeper from last season Mark Flekken is also expected to go undergo his Bayer Leverkusen medical today, according to Sky in Germany.
Brentford are expected to receive £11m for the 31-year-old, Sky Sports News has reported.
Take a look at Caoimhin Kelleher's best saves in the Premier League, with Brentford closing in on signing the Liverpool goalkeeper.
He featured 10 times in the Premier League as he covered for the Brazilian through injury and unavailability.
And Kelleher performed very well, finishing in the top dozen goalkeepers for save percentage and passes completed, which is what a Brentford goalkeeper needs to do quite a bit of.
That's because Mark Flekken - who Kelleher will replace as the Bees' No 1 - finished top out of all Premier League goalkeepers in those two metrics.
With countryman Nathan Collins also an important part of the Brentford defence, it feels like a well-suited move for both goalkeeper and his new club.
Hallgrimsson wants to see Kelleher move
Republic of Ireland boss Heimir Hallgrimsson spoke openly about wanting Kelleher to leave Anfield in search of regular minutes as a first-choice goalkeeper elsewhere.
Kelleher, capped 22 times for his country already, secured his second Premier League title with the Reds this season but only started 10 games with Alisson ahead of him in the pecking order.
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On signing his new contract, the 20-year-old defender said: "I am so excited to extend my stay at Brentford.
"I have felt so welcome from the first day I arrived at the club, thanks to my team-mates and the care the coaching staff have shown me.
"I've wanted to play in the Premier League since I was a child and it's been so good to do that here