Plymouth 0-1 Millwall
Dany N'Guessan scored on his debut as Millwall progressed into the second round of the Carling Cup.
The striker, on loan from Leicester, slotted home after racing on to John Marquis's flick.
N'Guessan had a host of chances but he hit the post and twice had efforts saved by Plymouth keeper Jake Cole.
The hosts struggled to create openings but nearly forced extra time at the death, only for Matt LeCointe to see his shot saved by Steve Mildenhall.