Unai Emery believes he missed out on the chance to become the world's best coach during his time at Paris Saint-Germain because there was no VAR.
The Spaniard won seven domestic trophies in two seasons in the French capital but left in 2018 after failing to mount a serious Champions League challenge.
In their first season under Emery, PSG thrashed Barcelona 4-0 in the round-of-16 first leg only to suffer an astonishing 6-1 defeat in the return match at Camp Nou.
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A year later, they reached the same stage of the competition only to lose 5-2 on aggregate to Real Madrid, who went on to lift the trophy for the third season in a row.