Pep Guardiola is highly regarded within the game, but his failure to bring Champions League glory to Bayern Munich has left him exposed to critics who believe he should have done better. Next stop, Manchester City.
Following Bayern Munich's exit from the Champions League at the hands of Atlético Madrid, serious questions must be asked of Pep Guardiola.
On the face of it, many people would think it was absurd to question a man with a managerial CV like the one possessed by the Spaniard.
Three consecutive semi-final Champions League exits (all to Spanish clubs) have highlighted serious issues that Guardiola teams seem to have when trying to break down sides with their incessant tiki-taka passing.
His four year stint at Barcelona yielded a spell of unheralded success. Under Guardiola's stewardship the Catalan giants won three La Liga titles, two Champions Leagues, two Copa del Reys, three Spanish Super Cups, two UEFA Super Cups and two FIFA Club World Cups.
His time in Bavaria has proven to be just a successful on the domestic level, but he has failed to bring any kind of European success to the Allianz Arena. He followed Jupp Heynckes into the Bayern hot-seat, and it was never going to be an easy job after the Munich outfit had just won the treble.
The two clubs he has managed have arguably been the best teams in Europe at the time he was in charge. His superb Barcelona side contained one of the greatest players of all time - Lionel Messi, and was littered with world class stars such as Andres Iniesta, Xavi and David Villa.
At the time their only true rivals in the league were Real Madrid. If you could have hand-picked a job where league success was the priority, the one at the Nou Camp would have been the highest on the list.
The former Barcelona manager now faces what will surely be his toughest test yet, and will likely determine how his legacy is shaped. He is set to inherit an ageing Manchester City squad that many believe will require a major overhaul.
Yaya Touré is one player who is highly likely to leave, as he was un-fancied when Guardiola was in charge at Barcelona. Rumours have also been circulating regarding the futures of Joe Hart, Jesús Navas, Eliaquim Mangala, Martín Demichelis and Pablo Zabelta.
While he will surely be given freedom to spend, throughout the years Guardiola has considered himself more of a coach than a manager, and takes great pride in imposing his beliefs and philosophies on the training ground.
The other factor that will prove difficult for Guardiola is the level of competition in the English Premier League. There are arguably five or six teams who can realistically win the title, and this will be a new experience for the Spaniard.
It will be his chance to prove to critics that he can be successful with a team that have not experienced European glory before.
If he can bring Champions League success to the Eithad along with at least two Premier League titles, it will surely rank as his greatest achievement yet, and in turn dispel the notion that he may in fact be overrated.