Seven Hearts players have been sent off this term and this disciplinary record is likely to incur a Scottish FA fine.
"I don't think you must only talk and then punish financially. You must go a little bit deeper," said Laszlo.
"We will handle the situation internally.
"I said after the Rangers game that when a player is sent off that weakens the team.
"In the situation we are in we cannot accept this. Our club will be fined again.
"This message must be the last warning for everyone at this club."
Nade received his second yellow card on 73 minutes at Ibrox for kicking the ball away after the referee's whistled had blown for an offside decision.
The Edinburgh side took the lead soon after his dismissal but were pegged back by a last-gasp equaliser from Rangers.
Source: BBC Sport
Source: BBC Sport