Andre Villas-Boas's side are unbeaten since the opening day of their Premier League campaign but Sigurdsson believes that there is more to come from the club's new players.
"Once we click we will be clinical," said the Icelandic midfielder. "The signs are all there in our build-up play and the next step, consistent finishing, will be key.
"There have been a lot of changes to the squad in a short period but I look around me and see such quality that the goals we deserve and seek cannot be far away. How can they be?
"As the season progresses and we get more used to one another, the goals have to come and I am determined to play my part in that."
Sigurdsson moved to White Hart Lane from Hoffenheim in the summer.