The 20-year-old arrives on Tyneside after an impressive season in Ligue 2, where he made 34 appearances and kept 15 clean sheets. Jaouen has also earned recognition at international level, representing France's Under-21 side.
The young goalkeeper began his professional career at Guingamp before joining Reims in 2023. He gained valuable experience through loan spells with Rodez and USL Dunkerque, where he helped the club reach the Coupe de France semi-finals during the 2024/25 campaign before they were beaten by eventual winners Paris Saint-Germain.
Speaking after completing the move, Jaouen expressed his excitement about joining the Premier League club.
"I'm really excited to become a Newcastle United player," he said.
"When I visited the training ground, I could see how passionate everyone is about the club and the work they do. I loved the environment straight away. I also had the chance to see the stadium and it's huge.
"I've heard so much about the supporters and how they are the best in the country. The passion of the entire city and the atmosphere at St James' Park are famous throughout football, and I can't wait to experience that for myself."
Jaouen also highlighted the qualities he believes he can bring to the team.
"As a goalkeeper, I enjoy one-on-one situations and playing as a modern keeper, building from the back and being comfortable with the ball at my feet. Now I want to develop alongside the amazing players and staff here, enjoy my football, and prove my value on the pitch."
Newcastle head coach Eddie Howe welcomed the arrival of the Frenchman and believes he has significant potential.
"Ewen is a great addition and I am delighted to welcome him to Newcastle United," Howe said.
"He is an exciting young goalkeeper who has shown real promise during his time in France. He has a calmness and presence that belies his age, and he's someone we feel can grow and improve within our environment."
Sporting director Ross Wilson revealed the club had been tracking Jaouen for several months before completing the deal.
"This is a signing we have been working hard on for a number of months, and we are really pleased to get it over the line," Wilson said.
"Ewen is a hugely talented young goalkeeper who has gained a lot of admirers across European clubs. What stood out for us was his ambition, his focus and his determination to be here."
Jaouen is expected to join Howe's senior squad immediately as Newcastle continue to build for the future.
Rodri has insisted his attention remains firmly on the 2026 FIFA World Cup, brushing aside ongoing speculation over his future at Manchester City despite having just one year left on his contract.
Wataru Endo has withdrawn from Japan's 2026 FIFA World Cup squad due to injury and confirmed he is stepping away from international football, bringing an end to a long national team career.
Borussia Dortmund have reportedly moved ahead of Aston Villa in the race to sign AS Roma winger Matias Soule, with the Bundesliga club reigniting their interest in the Argentine international ahead of the transfer window.
A wide-ranging agreement between FIFA and global players' union FIFPRO is set to make release clauses a standard feature in player contracts from 1 January 2027.
