Palace won 2-0 to reach the round of 16 3-1 on aggregate.
Maxence Lacroix and Evann Guessand struck for Palace and Glasner said afterwards: “A good win – an important win. It's a clinical win.
“I think we learned the lessons from the away game, being more balanced and more patient. I think we controlled the game and just waited for the moments.
“We could have taken the lead a little bit earlier. Twice we were a little bit unlucky, two deflected balls, I think, from Evann Guessand and Daichi Kamada.
“Then, a good set-play, a good free-kick. And then we said at half-time ‘let's keep the ball speed high and stick to the plan.’ Then, there would be moments when they would be more open and wait for the situations.
“We could have decided the game a bit earlier, it took us into the stoppage time and then Evann Guessand decided the game. A second home win, back-to-back win at home, second clean sheet – a very good win.”
Glasner added, “To be honest, in the last weeks, and we said about it, we had to press the reset button after the January transfer window.
“Since then, we had just 10 terrible minutes against Burnley, everything else is really good. Playing at Nottingham (Forest), getting the draw there; winning at Brighton; winning now twice at home. Not everything is perfect, to be honest, but you can see the players are feeling better and better in the way we are playing."