The main factor in the signing of Gakpo was the attraction of joining the club, according to the manager.
The Reds have agreed to sign the Dutch forward from PSV Eindhoven in a deal worth over forty million dollars.
Gakpo scored three goals as the Netherlands advanced to the quarter-finals of the World Cup.
"We didn't need to convince him, we didn't need to convince him at all, we didn't need to convince him at all, we didn't need to convince him at all, we didn't need to convince him at all."
We didn't talk to him because there was no reason for me to speak to him.
Some of the nice moments when you are a manager are when you think you have to convince someone, but when you speak to them you realize the door is open.
Gakpo has scored nine goals and provided 12 assists for PSV this season.
He has three goals and two assists in the European competition.
Manchester United had been heavily linked with a move for Gakpo, who said Van Dijk had told him that joining Liverpool would be "the right move".
"We spoke a lot over the phone [in] the last days," Gakpo told Liverpool's official website.
The club is a really big and massive club, but also like a real family, that's what he told me.
I think that's important for me because I'm a family man. He only talked about good things.
He can help me with some things. I'm very thankful to be here.
The paperwork to allow Gakpo to make his debut could take too long because of the game on 2 January.
Gakpo is one of a number of forwards that the Reds now have competition for.
Firmino's future at the club won't be affected by Gakpo's signing, according to the manager.
We talked to Bobby." I don't want him to leave. It doesn't have an effect.
You would have to ask Bobby if it affected him.