Southampton's mass exodus over the summer had been predicted, but few saw Calum Chambers' move to Arsenal coming.
The full-back had only just emerged as a Premier League player at St. Mary's for one season, but Arsene Wenger still had the faith to part with £16 million to secure the versatile defender.
He has been proven correct to trust his judgement, too, as Chambers' start to life at Arsenal has been hugely impressive.
Many expected the 19-year-old to play a backseat role when he moved to the Emirates, as they looked to continue his progression, but he has been regularly utilised in the side's first-team.
Played in an unfamiliar position of centre-back, the England international has shown no fear in his displays to date and has adjusted to the step-up in class with consummate ease.
Chambers has made an appearance in every Premier League game so far this season and he will be hoping to continue get this exposure to first-team football as the campaign progresses.
To do this, he will have to maintain his high standards and he will be looking to do just that against his former club tonight.
Southampton travel to North-London full of confidence, following a sensational start to the season and they will be hoping to show Chambers that his departure is not a problem for them.
So far the Saints summer recruitment has proved prudent and they appear to have strengthened despite many of their protagonists leaving over the summer.
The squad has stepped up the challenge and Chambers will be in direct competition with his ex-teammates tonight, where he will be wanting to show that they do miss his quality.
The 19-year-old was used as a right-back on the South-Coast, but given his form at Arsenal, it seems he is more comfortable in the heart of the defence.
However, his place there at St. Mary's would be no means have been guaranteed. Jose Fonte is one of a number of stars who have stepped up the increased responsibility given to them and he is surpassing Chambers in some areas.
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He has proven to be better in the air than Chambers and also shown a greater understanding of the game, making a considerable amount more interceptions on average.
What most be noted, though, is Chambers' incredible tackling skill. The 19-year-old is yet to mis-time a challenge and he is proving to be a sturdy defensive option for Wenger to select.
It seems that the pair could have made a commanding, complementing partnership at the heart of Southampton's defence had Chambers stayed, but the Saints' loss has certainly been Arsenal's gain so far, even if it hasn't had as much of a negative effect on Ronald Koeman's squad as most expected.