The Dutchman has signed a five-year contract in a deal worth around 38.5 million, becoming the fourth midfielder to arrive at the club this summer.
He was unveiled as a Reds player late on Friday evening with just over an hour until the transfer deadline.
The announcement came with a picture of Gravenberch perched on an exercise bike holding a phone and wearing a Liverpool shirt, similar to an image that has circulated online in recent weeks.
It had led fans to believe that the 21-year-old was a boyhood fan, but he explained the photograph in his first interview since joining the club.
Oh, seriously? I didnt see it, remarked Gravenberch when questioned on the origins of the image.
Welkom to the Reds! ?? pic.twitter.com/EQY717gsTX
Liverpool FC (@LFC) September 1, 2023
