The Peruvian international centre-back, now 30, reveals this happened back in 2016 when Jurgen Klopp came calling and admits he now regrets turning down the dream switch.
"I was a stone's throw away from playing in Liverpool," he said.
“These are decisions that you make, and then you regret them. My team-mates told me: 'It's Liverpool', but I had to keep my word. Besides, I'm very fond of Frankfurt."