The centre-back put pen to paper on the deal at Melwood on Friday afternoon, committing his future to the Reds.
Matip told Liverpoolfc.com moments after inking the terms: “It’s a great feeling to be a longer part of the club. It’s really just a great feeling.
“From outside, you know Liverpool is such a big club – but when you are inside, then you really get a feeling for how big the club is. In all the countries, the supporters are everywhere. It’s a massive and big club that I think every player would want to play for.