Herrera had tipped David De Gea to shut critics up when the season kicks off in August.
De Gea made a costly mistake in Spain's opening match of the Russia world cup gifting Ronaldo an 'undeserved' goal.
However, Herrera thinks he's the best goalkeeper in the world and will prove it yet again.
With the signing of Allison from Roma, Liverpool have a goalkeeper who can contend with the Manchester United goalkeeper for the Golden glove this season.
De Gea who moved just one save at the just concluded world cup will be hoping he can retain the title that has been his in recent seasons.
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