Ruud Gullit believes he has pinpointed where Pep Guardiola's struggles in the Champions League have come from since the Spanish manager left Barcelona.
Guardiola won Europe's top prize twice with the Spanish giants, first in the 2008-09 season and again during the 2010-11 campaign.
He has yet to win the competition since leaving the club, despite managing Bundesliga giants Bayern Munich before taking over at Manchester City, having reached the semi-finals of the competition on multiple occasions with the German side.
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The 48-year-old has failed to get Manchester City into the last four during his time in charge of the English side, with Wednesday's failure against Tottenham the second year in a row he's seen his side knocked out at the quarter-final stage by a domestic rival.