Lionel Messi

Valverde would surely want the Argentine megastar to steal the show and become the backbone of Barcelona's attacks once again. Messi has amassed a total of 44 goals combined in the Champions League and La Liga this season, topping the goalscoring charts at both competitions.
Everyone knows that stopping Messi would be a difficult task for any defender. However, the Argentine will now have a worthy opponent in Andrew Robertson. The Scottish defender has performed impressively for Liverpool and is currently one of the best left-backs in the Premier League.
One would expect Barcelona to attack Liverpool relentlessly in this match. Hence, Messi could have ample opportunities to weave his magic against the Reds. Messi's goal involvements at the Camp Nou will be very important for Barcelona against Liverpool, and he will definitley be the centre of attention in this match.