Graeme Souness' side battled to the last after falling behind to Dean Richards' first half goal and the boss was certainly clock-watching as the game entered stoppage time.
"Three minutes turned into five - we were a bit anxious there," said Glenn. "The same thing could have happened as did at Villa Park, fortunately it didn't.
"The first 20 minutes was excellent, we should have been two up before Blackburn came out of the traps. That 20 minutes seems a distant memory as people tend just to remember the latter period of the game."
Glenn added that after a taxing schedule of games the boys were forced to call on energy reserves and show great character to finally claim the three points.
"They threw caution to the wind and put a lot of bodies forward. After four games in ten days we had to really dig deep today and that is a great sign as Tottenham manager because in the past Spurs sides have had a soft centre.
"We showed we haven't got a soft centre and dug in and got our noses ahead with Deano's goal. There are different ways you have to win a game and see a game out - this was a resilient one."
Glenn admitted to a touch of anxiety towards the end of the Blackburn encounter, but was full of praise for the resilience of the team.