The Reds welcome Spurs to Anfield on Sunday in a 4.30pm GMT kick-off, the first of two games at home in the coming days.
The second fixture will see Arne Slot's side take on Galatasaray in the second leg of their last-16 Champions League tie on Wednesday as they look to overturn a 1-0 deficit.
In his official matchday programme notes for the meeting with Tottenham, Van Dijk writes: "Every game is important when you play for Liverpool, and in particular when you reach this stage of the season, but there's no doubt that this is a very important week for us.
"We returned from Turkiye and our Champions League game with Galatasaray frustrated, disappointed that another tight game went against us in the end. We weren't at our best level, that is true, but we still had enough chances to come away from a tough game with a positive result, and that is where our frustration comes from.
"There is, however, no time to dwell on things. We know that it is only half-time in the tie, and we will look forward to the second leg at Anfield on Wednesday knowing we have both the opportunity and the quality to reach the quarter-finals.
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"Before we even think about that, though, we must make sure we are fully focused on delivering a strong performance against Tottenham.
"The importance of this game is clear given the Premier League table, and that applies to Spurs too. A lot of people will focus on their recent results, but from our perspective we know that we will be facing a team that will be extremely motivated, and which still possesses a lot of quality. It is therefore down to us to set our own standards, both with and without the ball.
"We always want to create chances and be dominant in possession, of course, but as I say so often, the basis for that is always the same; hard work, togetherness and commitment.
"That means that in every challenge, every duel, and with every recovery run, we have to be at 100 per cent. Stick together, give everything and fight for everything, from the first whistle to the last.
"We are playing at home, and we are all responsible for making sure that the atmosphere is spot on. We know that you guys will be backing us as always, but we also want to give you something to really get behind.
"We know the sacrifices you make to support us all over the world, whatever the weather. We saw and heard you in Turkiye, as we did twice before that in Wolverhampton. As players, that is really important to us and I can assure that your support is never taken for granted.
"Like I say, this is a big game at the start of a big week, and that is an exciting prospect for each and every one of us. We should embrace and enjoy the challenges that lie ahead, and I am confident we will.
"I would also like to mention the fact that the game sees the Liverpool FC Foundation celebrate its Community Day, an event held to mark the incredible work that they do.
"In my time at the club, I have been lucky enough to see the LFC Foundation's work close up, and it is something which always impresses and strikes a chord with me.
"This club, this city, is about standing together, helping one another and being part of a community, and the LFC Foundation represents that in the best way possible.
"I would urge anyone reading this to learn more about their work, and to get involved however you can as they look to support even more people in our communities."