Conor Gallagher says his decision to join Tottenham proved "very easy" and the midfielder has been hailed as a player of "huge experience" by Spurs boss Thomas Frank.
On the completion of a £35m switch from Atletico Madrid, Gallagher, 25, said: "I'm so happy and excited to be here, taking the next step in my career at an amazing club. I wanted to be a Spurs player and thankfully the club felt the same. It was very easy, it happened very quickly and I'm ready to get on the pitch.
"I know how great the fans are, I'm really happy to be a part of it here and want to create special moments and memories together."
Former Chelsea midfielder Gallagher made 77 appearances for Atletico, having joined in August 2024.
His arrival comes as Frank faces pressure, with Spurs sitting 14th in the Premier League and on a winless run of four matches in all competitions.
"Conor is a top midfielder, who we have worked tirelessly to add to our squad," said Frank.
"He is still young, so has plenty of room for improvement, but also has huge experience across the Premier League, La Liga and with the England national team.
"Conor has captained teams, so will bring leadership, maturity, character and personality to our dressing room, while his running power, pressing ability and eye for goal will strengthen us in a key area of the pitch.
"I'm excited about working with him every day and I know the fans will love what he will bring to the team."