Date of birth: March 2, 1972

Instagram: N/A

Club(s): Espanyol, Southampton, Tottenham, PSG

Country: Argentina

Never one to shirk a challenge, the Argentine was a surprise appointment at Espanyol in January 2009. Against the odds, the former centre-back guided them to safety and a memorable win at Barcelona. Left the Catalonia-based club with credit and his high energy and pressing captured the imagination at Southampton and then saw Spurs swoop in. Took Tottenham to uncharted territory with a Champions League final appearance, before his controversial sacking just months later. Now, the Argentine is at the helm in charge of PSG, aiming for European glory where others before him have failed.