When Brighton and Brentford meet this Sunday, the rest of the Premier League will once again be forced to acknowledge two clubs that have made overachievement look routine. Backed by data-obsessed owners who turned their gambling instincts into football gold, both sides have climbed from League One to the upper reaches of the top flight — and this season, a Champions League push is not beyond them.

Yet history offers a sharp warning. The Championship and League One are scattered with clubs once celebrated as Premier League blueprints, whose stories eventually unravelled in ways nobody saw coming.

The cautionary tales

Wimbledon punched well above their weight throughout the 1990s, reaching the top nine in three of four seasons — all without a permanent ground. Bolton Wanderers played European football in the 2000s and came within three points of a Champions League berth. Southampton and Swansea City, the darlings of the early 2010s, showed that modest clubs could thrive among the elite. Then came Leicester City, Premier League champions in 2015/16, FA Cup winners, and European semi-finalists — before back-to-back relegations ended their era.

None of those clubs are in the Premier League today. Leicester and Wimbledon are in League One. Swansea City have spent eight years in the Championship. The fall, when it comes, tends to arrive faster than anyone imagined.

What went wrong

Several patterns emerge from these collapses. Bolton and Charlton Athletic were built almost entirely around one manager — Sam Allardyce and Alan Curbishley, respectively. When those men left, so did the identity of the club. Charlton were relegated the season after Curbishley departed; Bolton never finished in the top half again after Allardyce moved on.

Southampton and Swansea City managed multiple managerial transitions more successfully. Southampton secured top-eight finishes under Mauricio Pochettino, Ronald Koeman, and Claude Puel. Swansea's rise began under Brendan Rodgers, continued under Michael Laudrup, and produced an eighth-place finish under Garry Monk. Yet one bad appointment at each club began a chain reaction. Puel's successor at Southampton, Mauricio Pellegrino, struggled badly. Swansea burned through Francesco Guidolin, Bob Bradley, Paul Clement, and Carlos Carvajal in quick succession.

Transfer strategy also played a role. Allardyce's Bolton blended overseas flair — Jay-Jay Okocha, Nicolas Anelka — with experienced domestic professionals like Gary Speed and Kevin Davies. Southampton unearthed Virgil van Dijk, Sadio Mane, and Dusan Tadic; Swansea discovered Michu, Wilfried Bony, and Gylfi Sigurdsson. But eventually, every club's recruitment edge dulled. Leicester City, having struck gold with Riyad Mahrez and N'Golo Kante, could not repeat the trick — and an unchecked wage bill hastened their downfall.

Why Brighton and Brentford are different — but not immune

Brighton have built genuine managerial continuity, progressing from the pragmatism of Chris Hughton to the possession-based systems of Graham Potter and Roberto De Zerbi, with Fabian Hurzeler now adding a higher press to the mix. Brentford lost Thomas Frank, a coach central to their identity, but Keith Andrews has maintained the team's direct, physical style while introducing his own ideas without dismantling what was already working.

Owners Tony Bloom at Brighton and Matthew Benham at Brentford remain the most important figures at their respective clubs. Unlike Leicester City, whose decline was accelerated by the tragic death of owner Vichai Srivaddhanaprabha, or Southampton, whose owner Gao Jisheng failed to match fan expectations, or Swansea City, whose American consortium takeover was bitterly contested, both Bloom and Benham appear firmly in control and genuinely invested.

Still, no club is truly bulletproof. Only months ago, a portion of Brighton's own fanbase was calling for Hurzeler's removal. Rivals across the league are working to close the recruitment gap that Brighton and Brentford have long enjoyed. And the history of English football is full of clubs who believed their model was too good to fail — right up until it did.

Brighton and Brentford have done almost everything right. The challenge now is to keep doing it, season after season, long after the admiring glances have turned into attempts to copy them.