Robertson scored on the night, while Liverpool still needed Virgil van Dijk's injury-time header to earn the 3-2 victory.
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"We need to get back to winning a bit simpler and easier," said Robertson afterwards.
"The assistant manager turned to me when Virgil put it in and said he's getting too old for this, so I can't imagine what the fans are like."
On his goal, the Scot also said: "I was just trying to get in the line of the keeper, so he couldn't see. It's a great finish – give me the Puskás Award now!"