Manchester City chief executive Ferran Soriano believes Pep Guardiola is the best coach in world football, but admits it is hard to argue with Zinedine Zidane's record at Real Madrid.
Guardiola won five major trophies in his first three full campaigns at Etihad Stadium, including a clean sweep of domestic honours last season.
City look unlikely to retain their Premier League title, trailing leaders Liverpool by 14 points after a dramatic 3-2 defeat to Wolves on Friday.
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Zidane has come under scrutiny since returning to Madrid, despite an incredible first stint at the club that saw him win three successive Champions League trophies.