L'Equipe says while former PSG chief Antero Henrique was involved, then Parisien coach Tuchel was the biggest influence on the deal.
A personal one-on-one meeting between Tuchel and Herrera was enough to convince the Spaniard to commit to a five-year PSG contract.
This season, Herrera has been among PSG's best performers as they boast a 100 per cent record in Ligue Une.
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