Erik ten Hag felt Liverpool were "vulnerable" against Ajax as he rued bad luck in the 1-0 Champions League loss on Wednesday.
Ajax had their chances but Nicolas Tagliafico's first-half own goal was enough for Jurgen Klopp's Liverpool in the Group D clash in Amsterdam.
Liverpool were winless in three games heading into the encounter, and in action for the first time since Virgil van Dijk suffered a serious knee injury on Saturday.
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Ten Hag said he felt the Eredivisie giants could have taken advantage of the Premier League champions.