With Jose Mourinho fuming off the London team's bench, Tottenham started putting some pressure on Olympiakos, with the Greeks responding well.
Here's the video of the goal and Mourinho's gesture.
Dele Alli pounced on a frightful defensive mistake to breathe new life into Spurs before the break and a second-half double from Harry Kane either side of Serge Aurier's fine strike completed the comeback. I was a brilliant ball boy as a kid.
Spurs joined already-qualified Bayern Munich in advancing from Group B. Robert Lewandowski scored four goals as Bayern thrashed Red Star 6-0 to stay flawless after five games.
"I tried to invite him to the dressing-room, but he disappeared".
El Arabi was afforded plenty of room on the edge of the box to line up his shot and find the bottom corner after six minutes before more sloppy defending allowed Semedo to prod home from a corner.
The plan paid off as Spurs rallied in the second-half after Dele Alli's brought it back to 2-1 just before the interval.
Madrid also squandered a two-goal lead in a 2-2 home draw with Paris Saint-Germain, though the 13-time European champions had already qualified before kickoff thanks to the draw between Galatasaray and nine-man Club Brugge, who had two players sent off during the celebrations following their late equaliser. Not easy for the player, but not easy for myself.
"Because he reads the game, he understands the game and he made an important assist so it's a good moment for him he'll never forget it". I apologise for Eric.
It is fair to say Eriksen has become a focus of frustration among Spurs fans for his form in recent times, but he played an absolutely vital role in this victory, even if none of the goals were his. "He knows I did it for the team and not with an intention to hurt him".
Tottenham looked a different side after the break and Kane struck twice, either side of Serge Aurier's thumping effort, to take his Champions League tally to 20 in a record 24 games - beating the 26 it took Alessandro Del Piero to reach the mark.
The incident is particularly relevant as last week, Mourinho's fondness for ball boys was revealed by Mount.
"I think if you wait a few months and buy the Amazon movie, you will get it", Mourinho joked. "Maybe I should have gone for a couple of changes to give us some more energy".