"That's what this team is all about," the Dutchman told Liverpoolfc.com post-match. "We have so much quality, and the manager can only start 11.
"(But) everybody is eager to perform well for himself, for the team and for the fans when they are coming on, and at the beginning of the season everyone had the belief that, 'OK, I'm not starting today but when I come on, you never know what is going to happen, and if I put all of my energy out there then beautiful things can happen.'"
Gakpo continued: "It's not easy, but what (the manager) says is that we need to bring extra energy and impulse. Especially for me because I'm an attacker, but also defending-wise with the counter-pressing, we need to give an extra energy boost.
"Often when we did that this season it worked out very well. Today again, Robbo, another substitute, gave me the assist, so well done!"
He added: "We had a lot of possession.
"But in these games, you know you have to score the second and third one because you never know what will happen.
"And then it happened, they scored, and I think we tried to stay calm and we did it really well, not being in a rush to score the second one and forgetting the things we did before.
"I think we did really well on that point and then Macca scored a beauty! Big relief and I think after that it was like (it was) game over."