Suarez, 9. Photo by Marc Puig i Perez http://www.flickr.com

Football, like many other things in life, is subject to shifting fashions, and I’m not just referring to the design of the multiple kits that teams deem necessary these days. There are tactical fashions too, many of which have been shaped by Barcelona over the last decade or so.

The Barcelona side built around Xavi and Messi set the template for fluid attacking football that has been much imitated but with rather sporadic success since those doing the imitating have been attempting to do so without the aforementioned superstars.

One consequence of the fashion to play tiki-taka has been a reduced influence for what we might call the traditional centre forward.

With Messi playing as a ‘false 9’ (something that Totti was already doing at Roma incidentally), Barcelona became one of the greatest sides of all time without much need for a true 9 – just ask Ibrahimovic.

But when Barcelona signed Suarez in 2014, it signified the end of the tiki-taka era and the introduction of a more direct style at the Camp Nou to take advantage of the fearsome Messi-Suarez-Neymar (MSN) frontline. Messi and Neymar would float around as fluidly as ever, while Suarez would be exactly where you would expect a number 9 to be: front and centre.

I’ve written before that Barcelona have shifted the focus of their game to the forward trio rather than the midfield trio, which (when led by Xavi) used to create the “passing carousel” that caused such anguish to Sir Alex.

The Catalans may not be quite as dominant as a few years ago but where they lead others remain inclined to follow. Look at the top of the Premier League: Chelsea (Costa), Tottenham (Kane), and Manchester City (Aguero). Number 9s (even if that’s not always the number on their back) are enjoying a renaissance.

Interestingly, the fourth placed team in the Premier League remain tactically closer to a tiki-taka style of play. Roberto Firmino is many things but he is not a centre forward. Nevertheless, he has played as the focal point of Liverpool’s attack (in a false-ish 9 position) for most of the season.

Sturridge has been a combination of injured (as usual) or out of form and in any case is not in the same class as Costa, Kane and Aguero. The best that can be said of Origi is that he remains a work in progress with unfulfilled potential.

It’s unclear as to whether Klopp does not sufficiently trust his centre forwards to play them regularly or if his preferred tactical set-up has little need for them. Firmino, Coutinho and Mane (plus Lallana to a lesser extent) are tasked with bringing both creativity and cutting edge to Liverpool’s attack.

They’ve done so very erratically – Liverpool have struggled to break down lesser teams but are still currently the highest scoring side in the league. The main problem at Anfield is not the particular style favoured by Klopp but the lack of variability and adaptability on days when it’s not proving effective.

The absence of a true 9 in many games has hampered Liverpool’s ability to play more directly and pose a different sort of challenge to defences that are both packed and deep. The Liverpool boss should prioritise the signing of a centre forward in the summer, especially with Sturridge seemingly poised to leave.

Further down the league, the role of world-class strikers cannot be understated. Most of the progress made by Manchester United under Mourinho is due to the signing of Ibrahimovic, he who Barcelona struggled to fit into their tiki-taka rhythm.

Similarly, where would Everton be without Lukaku? At the other end of the table, Sunderland would be in considerably more trouble without Defoe. Arsenal have laboured for years now without a truly exceptional number 9 (and a few other missing numbers); Giroud is unfairly scapegoated on occasion but he’s no Costa or Kane.

Barcelona’s tiki-taka influenced the game defensively as well as in an attacking sense. Many teams sought more defensive cover and rigidity to guard against the shape-shifting nature of Barca’s movement. Strikers were primarily tasked with being the first line of defence and one was judged to suffice for such a mission.

4-5-1 thus became a common formation – sometimes of a more attacking disposition, often less so. It could be subtle, even at times sophisticated, but it was rarely swashbuckling. It tended to be dull though, particularly when 4-5-1 lined up against 4-5-1.

There is, no doubt, an art to defending (really there is PSG) but the artistry in football is primarily to be found at the other end of the pitch. A player such as Mascherano can paint in broad brushes but those with the talent of Messi and Neymar produce the masterpieces.

As in art, fashions change and usually they hark back to something that’s come before. The return to fashion of the centre forward is worth celebrating; welcome back number 9, may you cease to be false.