Speaking to talkSPORT, Glasner was asked what he told his players after the 2-1 defeat.
"Not a lot," he replied, before adding: "I think when you play here against a non-league team, I think you don't need tactics, I think you don't need a manager, honestly.
"I was a player for 19 years so I know these things can happen, but the way we played - their goalkeeper could be man of the match and we could be in unlucky situations - but it wasn't that.
"So that is what disappoints me most and this is what we have to change, we've seen this in the last weeks as well.
"We conceded another set-play goal, so all the things, losing a header because we have no timing and the attack, it's no physicality, no pace, no dribbling, and then it's tough against any team.
"But, on the other side, I think our U21s would have done better than we have done today. Therefore, things have to be changed."