Over the years, Arsenal's transfer business has regularly been scrutinised but one decision in August 2016 may have been the worst ever.

The criticism has ranged from their lack of spending during the final few years of the Arsene Wenger era to some calamitous signings in more recent times, such as Willian.

But the bold call to give up on the talents of Serge Gnabry has been catastrophic.

After a frustrating loan spell away at West Brom, in which then-manager Tony Pulis claimed the German attacker was 'not at the level' required to play for the club.

A year later, Wenger was happy to sanction his exit, with Bundesliga side Werder Bremen paying only £4.5m.

Since then, Gnabry has emerged as one of German football's most exciting talents and considering he's only 26, there has to be plenty more in the locker in the coming seasons.

The 5 foot 9 dynamo now plies his trade for titleholders Bayern Munich, where his transfer value has now reached a whopping £63m, as per Transfermarkt - that's a monumental increase of 1300%.

Gnabry joined the Bundesliga giants for just €8m (£6.8m) and has since won three league titles, a Champions League, a Super Cup and has gone onto land 29 caps, scoring 19 times in the process.

It's led to plenty around the game lauding his talents, from BT Sport pundit and former Manchester United defender Rio Ferdinand dubbing him "world-class" to ex-Bayern head coach Niko Kovac describing him as a "real weapon."

The Germany international has continued his fine form into this campaign, too.

After bagging ten goals and providing five assists in just 27 league appearances last term, Gnabry has already found the net twice from four appearances, as per Transfermarkt.

If he continues at this rate, then his value is only going to increase and with that, the Gunners' silly blunder will look worse and worse.

Forget Willian, the Granit Xhaka saga and much, much more - this has been one of the north London outfit's greatest disasters in the modern era.

AND in other news, Arsenal eye Lacazette replacement in £36m-rated "nuisance"...