Sigurdsson returns to Swansea where he enjoyed a successful loan spell in 2012, scoring seven goals in 18 top-flight appearances. Davies, 21, has signed a five-year contract at White Hart Lane while Vorm, 30, has penned a four-year deal.
Sigurdsson joined Spurs from Hoffenheim in July 2012 but struggled to establish himself in the starting side. The Iceland midfielder has signed a four-year contract and says he wants to help Swansea back into Europe.
“The main aim for the club is obviously to stay in the Premier League but we want to push on even further and get the club back into the Europa League like they were last season,” Sigurdsson said.
Crystal Palace were reported to have had a bid accepted for Sigurdsson but the playmaker insists Swansea’s style of football persuaded him to choose the Welsh club.
For Tottenham, Davies and Vorm are the club’s only arrivals of the window so far and Mauricio Pochettino’s first acquisitions since taking charge.
Davies earned a professional contract with Swansea in 2011 and has impressed in the first team, winning the club’s Young Player of the Year award for the past two seasons.
Tottenham had to fight off competition from Liverpool to land the young full-back, who has also earned 10 caps for Wales. Davies’ arrival brings into question the future of Danny Rose, who said at the start of last season he would not be happy sitting on the bench at White Hart Lane.
Dutch goalkeeper Vorm also faces a battle for first-team football under Pochettino, with Hugo Lloris already well-established between the sticks at White Hart Lane.
Meanwhile, Carlos Tevez insists he never thought about following Antonio Conte out of Juventus — even if his old foe Roberto Mancini had been appointed new head coach.
Conte left Juve last week having guided the Turin club to three consecutive Serie A titles and reports in Italy suggested Tevez, whose 19 league goals were key to Bianconeri success in 2013-14, had subsequently asked the board to clarify his own position.
Fresh from departing Galatasaray, former Manchester City manager Mancini appeared to be an serious option to replace Conte.He had worked with Tevez at City before the pair’s relationship soured when the striker was accused of refusing to come off the bench during a Champions League match in September 2011.
The potential issue was swerved, however, when Massimiliano Allegri was handed the Juve job, but Tevez stressed he was fully committed to pursue a fourth straight Scudetto with the club regardless.
“I never spoke to (director of sport Beppe) Marotta,” Tevez said.
“I’m just a player and (the board) don’t need to ask for my point of view on these matters. I think the papers should show greater respect when they write these things. Leaving the club has never entered my head.”