After Manchester City, Manchester United and Arsenal dropped points at the weekend, the Reds knew victory at Vicarage Road would put the pressure back on their rivals.
The result was clinched in style by Emre Can, who struck a Goal of the Season contender with a sensational overhead kick to spin the ball beyond the reach of Heurelho Gomes.
Though the hosts hit the bar in stoppage-time, Liverpool held on - and Lucas insisted it was especially important to bounce back after the Anfield defeat against Crystal Palace.
“It’s another big result for us away from home against a very difficult and physical team with quality players, and especially after the weekend when other teams dropped points, so it’s in our hands now really,” he told Liverpoolfc.