"Attack wins you games, defence wins you titles."
You couldn't have put it more aptly than Sir Alex Ferguson. Sure, you don't win games if you don't score. But you don't lose them either if you don't concede. And the latter always has a more positive impact on the players' psyche going into a long season.
So who all contribute when it comes to defence? Well, everyone on the field! In an age where forwards actually form the first line of defence, the entire playing XI is responsible for stopping the opposition from getting on the scoresheet.
That being said, defenders play a crucial role but when even the back line is taken to the cleaners, the man between the posts has to stand all.
Indeed, we see goalkeepers come up with some fantastic outings to win games on their own for their side. The heroics of the likes of David de Gea, Manuel Neuer, and Jan Oblak is well documented.
However, what about the men sitting on the sidelines waiting for their chance to take the field? What about the second-choice keepers who, despite getting scanty playing time, are expected to deliver a good outing whenever called for?
We look at five such goalkeepers who in spite of being second in the pecking order have delivered time and again when their team has needed them to.
#5 Sergio Romero - Manchester United
The Argentina No. 1 was roped in by the Red Devils on a free transfer at the beginning of the 2015-16 season. This was the same summer when the famous fax machine saga of David de Gea would play out.
While Romero did start the first few games of the season for Manchester United, who were then under Louis van Gaal's tutelage, De Gea's failed transfer episode meant that the former Sampdoria shot-stopper would be moved to the bench. It has been that way since then.
Romero has featured in two UEFA Champions League games for the Old Trafford outfit but it is really the cup ties where he has thrived this year. The Argentine has kept a clean sheet in all the four FA Cup games he has played for United.
Romero also kept a couple of clean sheets in the Carabao Cup and conceded only twice. Unfortunately, though, those two goals came against Bristol City on a fateful night at Ashton Gate.
While Romero may lack discipline at times, his short-range shot-stopping ability is one of the best in the world.