"The first thing is that the most hard moment of the game for me was not when Olympiakos scored the first or the second goal, the most hard moment of the game for me was when I made the change in the first half", said Mourinho.
Cheered on by over 5,000 fans, Olympiakos just over five minutes into the game shocked the hosts with a long-range shot by Youssef El-Arabi that tossed the Tottenham goal net.
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The ball boy's speed in retrieving a ball that had gone out of play allowed Serge Aurier to launch it towards Lucas Moura, who crossed for Harry Kane to side-foot home. I was a brilliant ball boy as a kid and this kid was brilliant.
Mourinho told BBC Radio 5 Live: "I tried to invite him into the dressing room after the game to celebrate with the team but he'd slipped away".
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"He's there living the game and playing the game very, very well". Hurt the player but hurt myself.
"The most hard moment of the game for me was not when Olympiakos scored their first or second goal. The most hard moment of the game for me was when I made the change in the first half", said Mourinho.
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. You prepare the team, you work, you train, then the game starts and your action during the game is not very important. "It was a tough time, more than the changes or the tactical talk, I told them to keep calm, keep confident and believe in ourselves".
"I had to do it for the team. He knows I did it for the team and not with an intention to hurt him".
England captain Kane's 20th Champions League goal came in his 24th Champions League appearance, beating Alessandro Del Piero (26 matches) to the landmark. "Maybe I should have gone for a couple of changes to give us some more energy".