Leicester boss Claudio Ranieri praised Kasper Schmeichel as one of Europe's best goalkeepers after the Foxes edged closer to the Champions League knockout stages.
They claimed a 0-0 draw against FC Copenhagen after Schmeichel's late save denied Andreas Cornelius and Christian Fuchs cleared off the line from Benjamin Verbic.
The Foxes just need a point from their final two games against Club Brugge and Porto to reach the last 16, although saw their lead at the top of Group G cut to three points after Porto beat Brugge 1-0.
Leicester are the first debutant team in Champions League history to not concede in their opening four games.