Both have been linked with a move away from White Hart Lane this summer.
Defoe has been attracting strong interest from the likes of Stoke City, West Brom, and QPR, following the arrival of club record signing Roberto Soldado.
Sigurdsson meanwhile looks unlikely to secure a regular position in the Tottenham midfield this season following their summer reinforcements, despite only joining the club himself a year ago.
But manager Andre Villas-Boas has denied reports linking the duo with a move away, claiming the both players remain firmly in his plans.
“They are players we count on 100 per cent. Sigurdsson is completely in our plans,” Villas-Boas said.
“Defoe is a hero for Tottenham and has been doing well. He faces competition which he has always faced during his career.”
Tottenham have been one of the busiest Premier League clubs throughout this summer transfer window, bringing in three new midfielders and a new striker so far.
£8million Frenchman Etienne Capoue has joined Brazilian Paulinho and Belgian winger Nacer Chadli as the club’s third midfield reinforcement, while Villas-Boas and chairman Daniel Levy remain committed in the attempts to prevent Gareth Bale from completing a world record move to Real Madrid before the close of the transfer window.
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