Fabio da Silva says that the opportunity to sign for Boro was too good to turn down.
A favourite among fans during two seasons at the Cardiff City Stadium, Boro's latest acquisition could not resist the chance to once again play in England's top flight.
"To be back in the Premier League is fantastic," Fabio said.
"When I arrived [in England] Boro were in the Premier League. I know them well and I know the fans.
"It's exciting as well to be given the opportunity to come and play with Middlesbrough."
Boro fans will be equally familiar with Fabio, after the Brazilian defender scored a stunning half volley on Cardiff's visit to the Riverside last season.
"If I can score that goal every week, imagine!" Fabio joked.
"I remember that it was Goal of the Season at Cardiff.
"I have to help and I will do my maximum. I am energetic and I don't stop running - I will do everything I can."
The former Manchester United defender feels that Boro have what it takes to succeed in the Premier League.
"I think [Boro] had a strong team last season already, and have bought some good players.
"My ambition is to play well help the team. We are strong enough to stay in the Premier League.
"I am excited and I am happy now I have signed."