Tottenham Hotspur head coach Mauricio Pochettino says a loss in concentration was the reason why his side lost to Anderlecht on Thursday evening.
Spurs dropped to third in Group J of the Europa League after defeat at the Constant Vanden Stock Stadium and will need all three points when they host Besnik Hasi's at White Hart Lane in November.
"I'm very disappointed," Pochettino said.
"I think that we started the game very well, scored for 1-0 and then created some clear chances to score two or three goals, but you have to look at how the game changed on set pieces.
"On the first chance they scored, after that there was another big chance for them and it was difficult to come back into the game and play like we started the match.
"With the way we lost focus in the game you always pay because it changes the dynamic of the match."