The 21-year-old didn't waste any time in pulling on the Spurs shirt.
Welshman Ben Davies made his debut in Spurs's 3-2 win over Toronto FC, playing the first 45 minutes just five hours after his signing had been announced.
The 21-year-old had been training with Tottenham for the last couple of days after jetting out to join their North American tour, and it is believed his transfer was the first arranged in a complicated trio of moves between the London club and Swansea City.
Michel Vorm also moved to White Hart Lane, while Icelandic midfielder Gylfi Sigurdsson went the other way alongside a transfer fee.
Davies looked very comfortable in possession against Toronto, and alert as to where his teammates were when he got in forward positions. A couple of times he displayed varied passing techniques to find his teammate in space, choosing a patient, innovative approach rather than blind crosses into the box.
Waking up to watch my favourite Spurs play Toronto in a friendly. New boy Ben Davies starts. Ryan Mason too! pic.twitter.com/XHb9xzm4iQ— IZ Reloaded (@izreloaded) July 23, 2014
The former Swansea man was withdrawn at half time, with his fellow left back Danny Rose enjoying a much tougher evening than his new rival, both personally and as part of a fragile back four.
Spurs won after two superb goals from Erik Lamela put them into a 2-0 half time lead. Mauricio Pochettino then changed his entire outfield group at half time, and the ten new players, despite initially continuing the good play, were chased down by the home side. Toronto scored two goals that were poorly defended by both the Spurs midfield and the centre back pairing of Michael Dawson and Zeki Fryers, and it looked like Ryan Nelsen and Jermain Defoe's side would secure a famous comeback draw.
Up stepped Andros Townsend, who despite not having a decent game beforehand, managed to curl in a delightful strike with his right foot from the edge of the area to secure the win for Spurs.