The 19-year-old, who has already featured seven times for the first-team, embarks on his first temporary move away from the club following a successful season for Neil Wood’s side, which saw them achieve promotion in Premier League 2.
It has been a great week for Garner, who was named the Under-23s Player of the Year for 2019/20 on Thursday. The homegrown talent scored eight goals in 10 Premier League 2 outings last term and also bagged the winner in the EFL Trophy victory at Lincoln City.
The England Under-19 international will now join up with, new Watford manager Vladimir Ivic, and could make his debut as early as this weekend, against Sheffield Wednesday.