Alex Jakubiak has signed a four-year contract with Watford before agreeing a season-long loan with Fleetwood.
The 20-year-old has moved to the League One side - but could be recalled in January.
A statement on Watford's website read: 'The Hornets are pleased to confirm young striker Alex Jakubiak has signed a new four-year deal to extend his stay at Vicarage Road.
'And now the 20-year-old will further his development on loan at League One Fleetwood Town.