The Middlesbrough-born frontman, who will wear the number 11 shirt, signed on season long loan yesterday and will train with the squad for the first time today.
Upon signing Hugill said "it’s been a long time coming and I’m excited to get started".
"It’s big move coming to my hometown club, and hopefully I’ll do myself justice."
"It’s something I’ve grown up wanting to do is play for Middlesbrough. I’d break my back to be here, now I want to show people what I can do."
It’s only a decade ago that the striker was cheering on the team from as a fan and that adds an edge to his move.
The Boro fan said "I know the fans here because I was a season ticket holder in the North Stand with my cousin. I’ve had many great days and nights at the Riverside, and want to have many, many more."
Hugill is expected to be available for selection for the Birmingham City game on Saturday.
The striker signed for West Ham United for £10m in January, however has only made three appearances.