Kieran Trippier
Spurs defender Kieran Trippier will be under big pressure if he starts against Dortmund as he is coming up against a potent attack.
Additionally, the new summer signing Serge Aurier has been bought in to challenge for the right-back and is soon to rival Trippier when he gets up to full fitness.
Pochettino has got to decide on his number one option this season following the departure of Kyle Walker to Manchester City.
Trippier currently holds all the cards and put in a decent display against Everton, but one bad performance against Dortmund could see him slip down the pecking order and leave the door open for Aurier.