London - Eric Dier believes it is of vital importance that Tottenham bounce back quickly after the defeat to Bayer Leverkusen on Wednesday night.
Spurs clashed with the Bundesliga outfit in a Champions League fixture at Wembley, and went down 1-0 after a 65th-minute winner from Kevin Kampl. They have now failed to win in their last six games in all competitions.
The result put Mauricio Pochettino's side third in Group E with two games left to play.
"It was very disappointing that we couldn’t score, not just me," Dier told BT Sport.
"We are all very disappointed and it leaves us in a difficult position now.
"We have to get back to work tomorrow and go again.
"If you want to be a big team you have to bounce back straight away so we have got to do that."
Spurs' next challenge is the north London derby against Arsenal, which will take place at the Emirates Stadium on Sunday. Pochettino's side can move level on points with victory over Arsenal with only three points separating the top five sides.