The 17-year-old joins Sam Saunders’ side having been with the Hornets since 2017, signing his scholarship with the club ahead of the 2025/26 campaign.
In the first year of his scholar deal he made appearances for Watford Under-21s at the age of 16, and was part of the matchday squad for the first team in this summer’s pre-season friendly against Boreham Wood.
The left-footed midfielder has also received recognition from Sweden’s youth set-up.
Head coach Saunders said: “He’s at a good age and in a place where we can really help him to develop. We feel that it’s a great signing for both parties, so we’re really happy to get Kiefer in the building.”
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