A deep corner was headed on to the far post and Marco Reus volleyed the ball into the roof of the net.
The floodgates were now in danger of being thrown wide open as Dortmund showed no signs of relenting.
And it fell to Reus to make next week’s second leg a opportunity for Pochettino to rest the big names once more as he rounded off a move involving 21 passes by beating Lloris easily for 12-yards
Reus again, was able to move freely in among the Tottenham defenders, beating Lloris easily when picked out just 12 yards from goal. He was rounding off a move involving 21 passes.
BORUSSIA DORTMUND (4-2-3-1): Weidenfeller; Piszczek, Hummels, Schmelzer, Durm; Bender (Subotic 58), Weigl; Castro, Mkhitaryan, Reus (Ramos 82); Aubameyang (Kagawa 82). Subs: Burki, Sahin, Ginter,Leitner.
TOTTENHAM (4-2-3-1): Lloris; Trippier, Alderweireld, Wimmer, Davies; Carroll, Mason; Onomah, Son (Kane 76), Eriksen (Lamela 65); Chadli (Dembele 58). Subs: Vorm, Carter-Vickers, Walker, Bentaleb.
Referee: Cuneyt Cakır (Turkey).