The Belgian has arrived from Gent on a five-year deal.
The 24-year-old stopper, who was voted the goalkeeper of the year in Belgium last season, arrives on a five-year deal as Newcastle look to earn immediate promotion back to the Premier League under Rafa Benitez.
When explaining his decision to move to St James’ Park the Belgian had this to say to the official Newcastle United website:
"I'm very pleased - I'm very happy to be here. In Belgium, Newcastle is a really big club, and that's why I chose Newcastle.
"As soon as Newcastle showed their interest in me, and I spoke to the coach, Rafa Benitez, it was an easy decision to make."
Sels arrives with a big reputation as a potential future star and will immediately challenge for the number one spot with the currently injured pair of Rob Elliot and Tim Krul – whilst Karl Darlow will also be hoping to keep Sels out of the first-team picture.
Considering the amount of goalkeeping options available to Newcastle, with talented youngster Freddie Woodman also on the books, the decision to bring in Sels might be a strange one.
But whilst Newcastle might need to make improvements in other positions, many a Newcastle fan on Twitter is happy to see Sels arriving – as it might spell the end for the currently injured Dutchman Krul.
His form had dipped even prior to his injury problems and many Newcastle fans on Twitter are pleased to see a potential replacement come through the door.
Here is how the fans reacted to the news of Sels’ signing on Twitter…
Matz Sels must signal the end for Tim Krul at #nufc .. Good riddance too. Crisp packet hands and can't kick a ball— Christopher Steele (@ChrisSteele90) June 29, 2016
Newcastle already has 4 keepers so the Metz Sels' signing is a weird one but still a very good business for a talented custodian. #NUFC— Qaizher (@Qaizher) June 28, 2016
Matz Sels.. Good signing? Hopefully. We need a left back, centre back and striker too really. #NUFC— Matt (@MatthewArnott) June 28, 2016
Know nothing about Matz Sels but thought GK was Newcastle’s strongest position even if Krul leaves with Darlow and Elliot. #Nufc— Tom Harris (@TomHarris15) June 29, 2016
The signing of Sels undoubtedly means Krul is on his way.— NUFC Global (@NUFC_Global) June 29, 2016
Reached his peak a few years ago & is prone to injury. Right move for all.#NUFC
£4.5 million for Sels. Don't think we'd pay that much for a back up goalkeeper. Bye bye Krul and Elliot? #NUFC— Jordan Gibbon (@Gibbo2910) June 29, 2016
Hope the signing of Sels means the end for Krul. Elliot especially and Darlow will feel very hard done by. #nufc— Tommy Franklin (@YorkMagpie) June 28, 2016