The England international has also called on his teammates to take advantage of the fact that Spurs are competing in their crucial Europa League second leg against Benfica tonight.
"We're relaxed and confident I think," Lallana told the club's official website. "It wasn't the greatest performance last weekend, but we got the job done and we'll take that result and the confidence that comes with it into the game on Sunday against Tottenham which is a massive, winnable game for us.
"They've got a tough fixture on Thursday night, so we want to take advantage of that and put them up against it from the first minute."
Spurs currently reside fifth in the league table.