Luis Suarez, playing his first game in the Premier League after serving his 10-game ban, was in scintillating form alongside strike partner Daniel Sturridge in Liverpool's 3-1 victory over Sunderland.
The win moved Liverpool into second place, level on points with Tottenham and just two points off leaders Arsenal on 15 points.
Suarez became a father for the second time last week, and teammate Lucas believes the Uruguayan is showing just how good he is.
The Brazilian told the Liverpool Echo: "Luis has just become a father again and for him to celebrate with two goals, I am very happy for him.
"He is showing again just how good he is. He is a world-class player and it is so important to have players like that if you want to fight for good things this season.
"Hopefully he will have another fantastic season for us like he did last year.
"Luis showed today with his performance that he is really committed to the team and to the club. He just wants to help us and we will try to help him too."
Despite the return of Suarez, Sturridge was handed the man of the match award thanks to his goal and providing two assists for his strike partner.
The Brazilian is expecting the strike partnership to improve over the course of the season and could prove to be very potent.
"When Dan arrived here, within a few months Luis got the ban so they didn't have much chance to play many games together," continued Lucas. "But you could see today how well they linked up. The understanding between them is really good and it will only get better.
"It will improve over the course of the season and hopefully they will keep helping us with goals and assists. It was really important for us as a team that we got back on track with a win.
"To lose at home to Southampton was really disappointing and we didn't perform the way we should have done. At Old Trafford we played well but didn't get the result. This was a great game for us to respond.
"After going 2-0 up, we knew they would come back at us at the start of the second half. They got back into it but after they scored we controlled the game quite well.
"We were solid defensively and then we got a brilliant goal on the counter-attack to kill the game off. Overall we deserved the victory and the three points has moved us back up the table."
Lucas, who has played 221 times for the Reds, will miss his side's next game against Crystal Palace after receiving his fifth yellow card of the campaign.
"To be fair, I think it was quite harsh," said the 26-year-old. "The previous booking I got against Man United was another one that I didn't think I deserved, but I will work to improve that element of my game.
"It is frustrating because having just got back into the Brazil squad I wanted to play every game I could.
"I wanted to help my teammates against Palace but I will be there supporting them and hopefully I will return against Newcastle."
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