Chris Richards struck to put Palace ahead, with Millwall equalising through Ryan Leonard. Palace went onto win the subsequent penalty shootout with Walter Benitez saving twice on debut as the Eagles won 4-2.
Glasner said afterwards: “It’s easy to sum up: bad performance, happy end, and I think that's it.
“We are unbeaten now – this season (it) is our eighth game. At the moment, it's more fighting than playing – so we fight for the points, for the wins, instead of playing for the points.
“But I know there will be moments and games, and the time will come when we will play better and it will be a better performance, and we will win."
On the spirit shown by Palace on the night, Glasner was delighted.
He continued: “To be honest, I'm always thinking ‘what’s the message?’ JP (Mateta) helped me today. I just quoted JP, because he said on the pitch, “Walter helped me”, and I said to him “you help us very often” – and this was the message: we win as a team, we play as a team, we lose as a team.
“Fortunately, we didn't lose, the whole season we didn't lose, for many weeks and months we didn't lose. Sometimes things don't come easily, we all know this.
“Sometimes you write an article and it flows, and sometimes you have to find every single word, and then you think: ‘ah, no, it's not good’. At the moment, we have to look for every single word, but then it's important when we press ‘Enter’, it's OK.
“There will be the moments. Now, it's important not to overload the players. We could show many things we can do better, but they know it, they are so self-critical, and now it's giving them a good feeling.
“Again, we're still unbeaten – a massive record for us, especially for this group of players, with all the difficulties they are dealing with.
“(Conceding) the equaliser in the 92nd minute… 94th minute, big chance, three players, including myself, were on the grass… and then ‘head up, take the penalties’. (They were) excellent, every single one, and we went into the next round. That's what we did today.
“Be patient with the programme, with the schedule we have, that not every single game will be a firework. Again, it's important not to lose – go into the next round. At the moment, it's more about the results than about the performances.”