Vincent Kompany, David Silva and Sergio Aguero.

All three players are Manchester City modern-day legends and when Aguero leaves at the end of the season when his current deal expires at the Etihad, it will mark the end of a transformative era at the club.

Since Aguero’s late goal against QPR which clinched City’s first Premier League title in such dramatic fashion, the Blues have developed into serial winners, and they've consistently challenged for major honours for almost the last decade.

That landmark triumph in 2012 was the catalyst for great success, and now City look set to win their third league title in four years under the tutelage of Pep Guardiola - the Catalan has arguably taken the club to yet another level.

However, while City have won everything there is to win domestically, there's one piece of the jigsaw that is missing. Regardless of City fans making their feelings clear to UEFA over the years, the Champions League remains elusive.

While Guardiola has previously shrugged off questions when asked about winning the competition, he recently admitted the pressure to succeed in Europe is 'always on our shoulders' - something City have perhaps struggled with in recent seasons.

Manuel Pellegrini brought City to their first Champions League semi-finals five years ago, but since then the Blues have fallen short for one reason or another, crashing out last term at the hands of Lyon in the quarter-finals.

With City travelling to Germany to play Borrusia Dortmund on Wednesday, it feels like this season could be the opportunity they've patiently waited for, and they head into the second-leg having won the previous encounter 2-1 in Manchester.

It's clear that the players in City's dressing room are hungry to win the Champions League, and none more than Kevin De Bruyne, who was reportedly giving assurances upon recently extending his contract that the club are striving to win the competition.

"He's such a nice guy. He is going to be a big miss. It would be great if we could win the Champions League so it could end well for him," De Bruyne said last campaign when asked about veteran playmaker Silva, who was set to leave City after 10 years.

The Belgian's desired Champions League send-off for Silva sadly didn't materialise, but De Bruyne - who has taken on a leadership role at City under Guardiola - can instead deliver his promise for the departing Aguero.

Despite Guardiola heavily rotating, the Leeds defeat was disappointing, however, City have still lost the fewest games across all competitions (four) from the remaining Champions League contenders this season.

Their credentials to go all the way in the competition are incredibly strong, and winning the Champions League would certainly be a fitting farewell gift to Aguero, the man who was behind the first success of the Sheik Mansour era.