Liverpool face Real Madrid in the Champions League final at the end of May but as it stands, Jurgen Klopp's side must beat the Seagulls to guarantee a place in next season's competition.
Robertson has dismissed any suggestion that the Merseyside giants are only thinking about the trip to Ukraine, acknowledging that the encounter with Brighton is still an important game for the club.
The 24-year-old told the club's official website: "We can't think about Kiev now. We know the media and the fans will be focused on that but for us it's all about Brighton.
"Effectively, we have two cup finals now. We knew how big a game it was against Chelsea, we didn't struggle to get ourselves up for it. We knew we could get the top four done before the final weekend, and believe me, that was a big incentive but we fell just short.
"We have one more game and we need a big push. We need everyone behind us for that. We know that if we win against Brighton we will be in the top four, regardless of how the other results go."
Liverpool have failed to win any of their last three matches in all competitions.