Spurs dropped to fourth in the Barclays Premier League after a lacklustre display at White Hart Lane against Fulham was settled by a goal from former striker Dimitar Berbatov. It was a second-straight league defeat, and allowed rivals Arsenal to close the gap to just four points, with a match in hand and far superior goal difference.
The Iceland midfielder, though, claims Spurs must concentrate on getting themselves back in form over the final eight league games, and he said: "We just need to pick ourselves up, stay together and perform well until the end of the season. It (a top-four finish) is in our hands and we are in a good position to make sure we get the Champions League spot."
He added: "We showed during the season that we are more than capable. Even though (we've had) a couple of bad results, we won't start doubting ourselves.
"It's down to us now and we have just got to make sure we are playing the way we've been playing throughout the season."
Manager Andre Villas-Boas made the expected changes after the 4-1 defeat against Inter in the Europa League last Thursday, which still saw his side progress to the quarter-finals on the away goals rule.
Wales international Gareth Bale was suspended for the European tie against Inter, and Sigurdsson felt fatigue should not just be used to explain why Spurs failed to deliver the required performance on Sunday.
"I don't want to be making excuses, but the 120 minutes probably played a bit of a part from Thursday night and also the travelling, but we could have played better even if we were tired," he said.
Sigurdsson feels the Spurs squad can regroup over the international break.
"We would have liked another game in a few days to make things right and get another three points on the table, which is important, but maybe it is a good thing because we can go away and reflect on what we have been doing in the past few games and make it right," he said.
Source: PA
Source: PA