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Take a look at Caoimhin Kelleher's best saves in the Premier League, with Brentford interested in the goalkeeper.
"I just want him to go to a club where he will play on a regular basis," said Hallgrimsson earlier in May.
"He has been playing at the highest level, whether it's the Champions League or the Premier League, and done really well.
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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
I can't wait for more next season and beyond!"
Follow the transfer window on Sky Sports
The first of two summer transfer windows is upon us - and there is no better place than Sky Sports to get all the latest transfer news and rumours.
Use the Sky Sports app and website for all your updates in our dedicated Transfer Centre and Premier League club blogs, plus live Q&As with our reporters throughout the summer.
The Transfer Show returns to Sky Sports News from Sunday June 1 for the start of the pre-Club World Cup window and will then be on every weeknight at 5pm and 7pm until the deadline on Tuesday June 10.
The summer transfer window will open again on Monday June 16 until Monday September 1 - with the deadline brought forward to 7pm this year.