The 20-year-old was one of the most highly rated young goalkeeping prospects in Europe and has even been identified by Real Madrid as a potential long-term successor to Thibaut Courtois.
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However, his next step will now take him to Tyneside, where he is expected to sign a four-year contract.
Jaouen impressed during a loan spell at USL Dunkerque in the 2024-25 season, narrowly missing out on promotion from Ligue 2 while also helping the club reach the Coupe de France semi-finals.
He returned to Reims following their relegation from Ligue 1 and has been their first-choice goalkeeper this season, although the club failed to secure immediate promotion.