Mauricio Pochettino hopes Arsenal will identify the "stupid person" who hit Dele Alli with a plastic bottle during Tottenham's Carabao Cup triumph at the Emirates.
Alli was struck on the head as the object was thrown at him near the touchline in the second half of Spurs' 2-0 quarterfinal victory, which set up a semifinal against Chelsea.
It comes just 17 days after a Tottenham fan threw a banana at Arsenal's Pierre-Emerick Aubameyang during the Premier League fixture between the sides at the Emirates, subsequently receiving a lifetime ban from Spurs and a four-year ban from all football matches.
"Yes I saw it," said Pochettino. "It was lucky that it wasn't a big issue. For me, OK we play a derby and we hate each other in a good way, but that is in a bad way when you go to damage some people or an opponent.
"I cannot talk in general because only one stupid person made a mistake. I respect the Arsenal fans, like I respect the professionals from Arsenal and I respect our fans.
"I hope that Arsenal take responsibility and through the camera they can identify [the person] because it wasn't a problem but it can happen to be a big problem -- some big issue, and how are we going to fix it?
"I think Arsenal are going to take some responsibility to identify the people. I cannot say nothing, because always for one cannot pay one million."
Alli said to Sky Sports after the match: "It is what it is. It made the goal a little bit sweeter and the win."
Alli was the star of the show for Tottenham, setting up the first goal for Son Heung-Min and then scoring the second himself with an audacious finish -- and Pochettino was unsurprised to see the 22-year-old delivering once again in a big match.
🤷🏽♂️😂 pic.twitter.com/hq9MaK5Fse
— Dele (@dele_official) December 19, 2018
"He loves to compete," said the Argentinian. "I've explained to you that in easy situations he gets bored easily. In training he gets bored easily if you don't put in opposition and you push him to compete, because he's an animal, a competitive animal.
"When he feels so comfortable, when he's in a very competitive space and situation, he always gives his best. Yes, that's a quality he has and you cannot buy that in the supermarket."
Spurs gained revenge for their 4-2 Premier League defeat at the Emirates earlier this month, but Pochettino felt the two matches were similar -- evenly balanced with a couple of moments of quality proving decisive.
"I don't know if after we analyse the game we deserve more than Arsenal," he said. "Of course I think the performance was so solid and of course you need some luck in some actions.
"I thought our keeper was fantastic, Paulo [Gazzaniga], and in the end we scored from outstanding actions, like from Sonny or Harry Kane with [his assist for] Dele Alli of course.
"The 4-2 in the Premier League looks so bad for us but I think during the second half, at 2-1, we controlled that game. I think for some mistakes we conceded and that changed the dynamic, and for some periods Arsenal were better, and we lost the game.
"Today was similar. I think both games were very competitive -- one game for Arsenal and one game for us. Now I think the most important thing is the result.
"We're going to play the semifinal against Chelsea and there's going to be two more tough games in this crazy fixture [schedule]."