"They know better than me but we are assessing him every day".
"Very disappointing because we did everything to win", said Pochettino.
With Tottenham likely reverting to their typical pressing style, these gulfs in quality will likely prove fatal - just as five of the last six Premier League encounters have ended for Swansea.
The England star will also miss the upcoming visits to APOEL Nicosia and Real Madrid, depriving Spurs of their foremost creative force.
Spurs' manager has a history of promoting academy graduates and putting faith in young players but he has sacrificed a few of them to build a more competitive squad. They came under greater pressure in the second period, with Tottenham stepping up the intensity as they sought a victor, but still Swansea refused to let them through.
Leading the line will be Dortmund's most potent threat - the goal machine Pierre-Emerick Aubameyang.
Mawson will face the hard task of containing the in-form Harry Kane, while Sanches, Clucal and Caroll will also have their hands full in midfield.
Kane showed the creative aspect of his game also, establishing Child of what needs to have been the 2nd goal of this laborious screen as deputy to the put on hold Dele Alli.
This included seven in nine matches in last season's Champions League, where Aubameyang feels right at home.
For all of Spurs dominance Pochettino's men struggled to get their first win at the Wembley Stadium.
Kane's goalscoring exploits in in the previous year have been particularly extraordinary.
Scoring 15 goals and laying down an assist in the league last season, the forward was expected to be reunited with his former boss Antonio Conte, after the relationship between the club and Diego Costa started to deteriorate. The players change because they are one year older, more experienced, maybe they achieve or have different environment, contract, everything, different girlfriends, ok.