Tottenham Hotspur's Christian Eriksen comes on as a substitute to replace Eric Dier during the Champions League match in Group B between Tottenham Hotspur and Olympiacos at Tottenham Hotspur Stadium, London, Britain, November 26, 2019. Eric Dier became the first Tottenham Hotspur player to discover Jose Mourinho's ruthless streak as the Portuguese manager's decision to haul off the midfielder after half an hour ultimately proved a masterstroke on Tuesday. REUTERS/Eddie Keogh

Tottenham Hotspur manager Jose Mourinho gives instructions to Christian Eriksen before he is substituted on during the Champions League match in Group B between Tottenham Hotspur and Olympiacos at Tottenham Hotspur Stadium, London, Britain, November 26, 2019. Eric Dier became the first Tottenham Hotspur player to discover Jose Mourinho's ruthless streak as the Portuguese manager's decision to haul off the midfielder after half an hour ultimately proved a masterstroke on Tuesday. REUTERS/Eddie Keogh

Tottenham Hotspur's Eric Dier is embraced by manager Jose Mourinho after being substituted off during the Champions League match in Group B between Tottenham Hotspur and Olympiacos at Tottenham Hotspur Stadium, London, Britain, November 26, 2019. Eric Dier became the first Tottenham Hotspur player to discover Jose Mourinho's ruthless streak as the Portuguese manager's decision to haul off the midfielder after half an hour ultimately proved a masterstroke on Tuesday. Reuters/Andrew Couldridge

Tottenham Hotspur's Eric Dier with manager Jose Mourinho after being substituted off during the Champions League match in Group B between Tottenham Hotspur and Olympiacos at Tottenham Hotspur Stadium, London, Britain, November 26, 2019. Eric Dier became the first Tottenham Hotspur player to discover Jose Mourinho's ruthless streak as the Portuguese manager's decision to haul off the midfielder after half an hour ultimately proved a masterstroke on Tuesday. REUTERS/Eddie Keogh

Tottenham Hotspur manager Jose Mourinho celebrates after Harry Kane scores their second goal during the Champions League match in Group B between Tottenham Hotspur and Olympiacos at Tottenham Hotspur Stadium, London, Britain, November 26, 2019. Eric Dier became the first Tottenham Hotspur player to discover Jose Mourinho's ruthless streak as the Portuguese manager's decision to haul off the midfielder after half an hour ultimately proved a masterstroke on Tuesday. Reuters/Andrew Couldridge

Tottenham Hotspur manager Jose Mourinho celebrates with assistant coach Joao Sacramento after Serge Aurier scores their third goal during the Champions League match in Group B between Tottenham Hotspur and Olympiacos at Tottenham Hotspur Stadium, London, Britain, November 26, 2019. Eric Dier became the first Tottenham Hotspur player to discover Jose Mourinho's ruthless streak as the Portuguese manager's decision to haul off the midfielder after half an hour ultimately proved a masterstroke on Tuesday. REUTERS/Eddie Keogh