#3 Alisson Becker
The Brazilian goalkeeper has successfully proven his worth to Liverpool so far. He even seems to have performed much better at the league than Kepa Arrizabalaga who is currently the world's most expensive shot-stopper.
He has also done well to replace error-prone Loris Karius at Liverpool's post. Becker's superb reflexes enable him to be excellent at stopping both long and close-range shots. His passing accuracy also has stood at a high 79.8 percent at all competitions. Overall, he is an error-free goalkeeper with no visible weaknesses.
Many would expect him to be tested a lot either from long or close range by Barcelona's deadly attackers at Camp Nou. Hence, he might need to perform at his best and make Liverpool's damage a bare minimum. Jurgen Klopp would also need his pinpoint passes to build an attack from behind.
Liverpool surely would not want him to make a mistake this time because Karius's goalkeeping error from previous Champions League edition had cost them enough. However, he should not have much trouble if both Van Dijk and Robertson perform at their best.