However, it was the hosts who could have taken the lead in the very first minute when Zdenek Ondrasek found himself in a good position inside the Spurs penalty area, but his shot went wide.
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Andre Villas-Boas's side began to assert themselves on the match and came close on a couple of occasions before the end of the goalless first half.
Then just eight minutes after the restart Sigurdsson thought that he had broken the deadlock when he turned home from close range, but it was chalked off because of a handball offence from Soldado in the build-up.
However, Spurs did not have to wait long to go 1-0 up, as a free kick bounced off Adnan Cauevic and into the net for an own goal.
Dembele was unlucky not to add a second to his name just moments later when his shot from close range came back off the post and his subsequent rebound hit the side-netting.