"Every time I know when I'm not playing well and if it's not going well for me".
The club's exploits in the Champions League - including a 3-1 home win against European champions Real Madrid - are in sharp contrast to their struggles in the Premier League, where they are have fallen 18 points behind leaders Manchester City.
Pochettino has named two academy youngsters in his squad - the midfielder Luke Amos and the striker Kazaiah Sterling - and he is ready to give a first Champions League start to George-Kévin Nkoudou, the winger who has struggled since his transfer from Marseille in the summer of previous year.
He has been sidelined through injury this term, but since recovering he has still failed to impress the Tottenham manager enough to warrant more than just one minute worth of Premier League football all season.
Alli's best performances this season have come in the Champions League, with the England global scoring a brace against Real Madrid and starring in a 2-1 win at Dortmund.
"Obviously I would like to be at the highest level, in every game, in every single training session, but I don't think that's possible".
"Of course the striker always needs to score", said Pochettino, according to the Evening Standard.
Liverpool legend Jamie Carragher delighted to draw Everton in FA Cup
Adding more spice to the occasion, Everton and Liverpool were also paired in the third round of the FA Cup on Monday night. Sammy Lee admits that he feels "honoured" to be part of Everton's coaching staff, despite his association with Liverpool .
Tottenham are certain to finish top of the group and, in that context, it felt slightly surprising to hear Mauricio Pochettino say Alli would start against Apoel.
"We are going to rest some players, rotate the starting 11, but Dele is going to play".
"No, I'm not anxious because the performances were good", he said.
"The most important thing now is to start to perform in the way we did against Madrid, Dortmund and Liverpool when we were fantastic".
"As a team, we need to build another good moment and it's a good opportunity to play well and only by winning games we are going to build again our momentum".