Atletico saw a late penalty denied by a VAR overturn, and that decision was seemingly one of the reasons why an angry Simeone stormed down the tunnel at full-time and refused to shake Liverpool manager Jurgen Klopp's hand.
"Luckily our squad is really experienced now, we've been to some really touchy places in Europe and in the Premier League and been able to cope with that (Simeone's theatrics)," Robertson told LFCTV.
"In the second half you saw that, especially when we took the lead and penalty for them wasn't given. I think in the last 10 minutes we've seen the game out really, really well when they were trying to push, and get close to the ball.
"They were trying to create that one last chance and we didn't allow it.
"I think that comes down to us being together for so long, and to us being a wee bit older and wiser than we once were, and that showed tonight.
"That's why we managed to see it out once we took the lead."
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