Barcelona boss Ernesto Valverde still gets surprised by Lionel Messi and said the star instilled fear in opponents after starring against Liverpool.

Messi scored a brace after Luis Suarez's opener as Barca took control of their Champions League semi-final by winning the first leg 3-0 at Camp Nou on Wednesday.

The forward's second was a tremendous 30-yard free-kick which brought up his 600th goal for the LaLiga giants.

Valverde said he was unsure how Messi continually delivered for Barcelona and the 31-year-old is still surprising the head coach.

"I just saw it [the free-kick] at pitch level, but the truth is, Leo's always surprising," he told a news conference.

"It was very far out, we didn't know what he was going to do. In the end, I don't know how he does it, but he always does.

"I'd rather not think how he does it, to be honest, but he always shows up when we need him the most, this time just when we were in situations in which we had to shake Liverpool's domination off.

"Through the way he plays and the way he gets close to their goal, he helped us play and win by a bigger margin – and he instills fear into our opponents."

Messi has scored 48 goals in 46 games this season for Barca, who have already won LaLiga and would complete a treble with the Champions League and Copa del Rey.