“I had never seen anything like it,” he told the Daily Mail. “I’ve not seen up until now a team that plays better, that presses better. That game had quite an impact on me.
“They suck the air out of you. You spend so much time defending and when you want to catch your breath and get on the ball for a bit, they’ve taken it from you again.
“I think Jurgen [Klopp] now has the team he first had in mind when he started four years ago.”
He added: “The difference is that when Unai comes into Arsenal they had been on a less positive run for three or four years.
“In his first season Arsenal finish just a point short of the Champions League and are just a small step from winning the Europa League.
“His arrival has been really positive for the club and will be positive in the long term. In a few years Arsenal can be one of the top ten sides in the world able to compete for everything.”
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