While Adelaide's exodus becomes more concerning for Reds fans, Riley McGree's transfer to Birmingham City via the MLS, and Reds' legend Nikola Mileusnic's move to Danish club Randers FC will likely garner the spotlight.

However, young midfielder Brook's transfer to Brentford is undoubtedly one of the most interesting offseason moves in Australian football. A three year contract beginning with Brentford's reserves, Brook's versatility is key to the Championship club's interest.

The 18-year-old has made just eight A-League appearances but has shone for Adelaide and proven why the Reds academy is so highly rated with his calm poise and excellent vision, however at Brentford, he's set to go up an entirely new level.

Discussing Lachlan’s arrival, Brentford B Head Coach Neil MacFarlane said: “Lachlan has been brought to our attention and he’s someone that will offer us a lot at the top end of the pitch, both assisting and scoring goals.

“He’s a really good character and he’s been playing men’s football which we’re starting to see with the players that have come into our B Team group recently, which is really pleasing. He won Young Player of the Year at Adelaide which is a really good achievement. He’s the type of player who can handle the ball and he has flashes of brilliance, so we’re absolutely thrilled to get this signing over the line and I think he will have a bright future at the Club.”

Despite a population of just 27,000 people in the Greater London area and until two months ago, a stadium capacity of just 12,000, the Bees finished third in last season's Championship.

It's the second time they've made the playoffs in the past five years as one of the smaller clubs in the entire English football league. 

They've achieved this success by acting as one of the purest development clubs in England, raking in huge sums from both transfers and selling-on fees, meaning they continue to earn huge sums as their academy products grow stronger from club to club.

Brentford have sold on nearly 10 Premier League players in the past five years alone, regularly earning transfer window profits of over $40 million. Just a few months ago they sold Ollie Watkins for $54 million to Aston Villa, less than two years after they'd bought him for $3 million from Exeter City.

Brentford's owner took over Danish outfit FC Midtjylland in 2014 and with Awer Mabil and a host of other extremely promising young footballers at the helm, they just made the Champions League for the first time.

This tiny English club are also expanding to Iceland and Uganda, in a City Football Group esque development spectrum showing every other minnow exactly how to create a powerhouse out of a back shed.

It's an extremely exciting destination for a young Australian footballer and one that promises huge returns in the future. It's also a pathway that Adelaide United could do well to try and replicate, as they seek to rebuild from a series of huge offseason losses.


Adelaide on exodus: When players have hunger, we support them

Adelaide United's attacking midfielder Riley McGree is joining teammates Lachlan Brook and Nikola Mileusnic in leaving the A-League.


Official: A-League prodigy signs for famed-English development club

Adelaide United A-League prodigy Lachlan Brook has signed for English Championship club Brentford FC.


Official: Adelaide A-League star seals European move

The huge exodus at A-League side Adelaide United continues, with star winger Nikola Mileusnic sealing a move to Danish Superliga club Randers FC.


Future Socceroos star signs for English club on MLS loan

Young A-League Player of the Year and Adelaide United and Olyroos star Riley McGree has joined English Championship club Birmingham City on loan from MLS expansion franchise Charlotte FC.


Official: Star A-League fullback seals England loan

Star A-League fullback Matt Millar has sealed an unusual three month loan to English League One club Shrewsbury Town from Newcastle Jets.


A-League's Adelaide sign 18-year-old 'revelation'

After 14 goals in 18 matches, A-League side Adelaide United have signed 18-year-old winger Domenic Costanzo from NPL South Australia outfit Croydon Kings.


Roo Radar Wrap: Showdown in Saitama and Jeggo stars in Europe

Amongst match-winning saves and a straight red card there was a clear winner in this weekend’s battle of Aussies in Japan, while James Jeggo helped Aris defeat Panathinaikos to remain top of the table in Greece.


Australia's football coaching revolution

Thousands of football coaches from grassroots to the elite will get access to a unique swathe of online learning under a groundbreaking plan to upskill Australia’s army of mentors.


Champions League will 'get very expensive' for A-League clubs

The Asian Champions League has been thrown into utter chaos this season and A-League clubs Melbourne Victory, Sydney FC and Perth Glory could suffer the consequences.