ROME, April 13 (Xinhua) -- Napoli head coach Rafa Benitez urged his side to improve defense following their 4-2 win over 10-man Lazion at home on Sunday.

Gonzalo Higuain scored his first Serie A hat-trick in a thriller where Lazio, though reduced to 10 three minutes after the break, threatened a lot in the second half.

Benitez was delighted by Higuain's performance but not the team's defense.

"We do still need to improve on the way we control the game after taking the lead," he said.

He suggested that Napoli should defend as a team to win.

"You can't win with just the attack or just the defence. What you need is a balance between them. We are well aware that we have to improve the way we defend as a whole unit and not just the back four," he said.

The Spaniard warned his players to fight for a place in the first team as nobody was assured of a place.

"We still have many important games to play and nobody can take their place for granted. We have many players who can support Gonzalo and they can all be used at different times," he added.