In the modern football era, there's no any manager in the world who's serving the club longer than him. Still, he is probably one of the unluckiest manager in the whole world. Got humiliated in the UCL round of 16 every year, sometimes his team played too many matches, sometimes his team played too few matches, sometimes referee didn't award penalty.
Almost signed Messi, Ronaldo, Ibrahimovic, Suarez, Kante to create The New Invicibles! But ended up with bargain players like Giroud, Koscielny, Sanchez, and Özil. And yet, he still came out with FA Cup champion and a UCL Group stage with a lower budget than the rest of big 6 even Tottenham!!! The biggest signing he ever made was less than half of the transfer of Paul Pogba. And yet he was highly respected for his attributes in the club's success and the financial stability. He was admired by the managers all over the world with the likes of Ancelotti, Bilic, Emery, and even the great SAF (Sir Alex Ferguson)