Midfield maestro Christian successfully dispatched a penalty just before the hour mark as the Danes took the lead on the way to a 1-1 draw with Romania in Copenhagen.
The result yielded the point Denmark needed to stay in second place in Group E and enter the play-off shake-up, with eight of the nine best second-placed teams in European qualifying set to be involved next month in a bid to reach next summer’s finals in Russia.
England had already punched their ticket prior to Sunday’s final Group F qualifier in Lithuania, in which Harry Kane, like Christian, scored from the spot in a 1-0 victory for the Three Lions.
Manager Gareth Southgate shuffled his pack and handed a senior international debut to young midfielder Harry Winks, who was only elevated from the Under-21 set-up last Monday night.
Right-back Kieran Trippier also started in what was his first competitive cap for England and only his second overall, playing the full match alongside both Harrys. Dele Alli, who won the penalty from which Kane netted on 27 minutes, was replaced with nine minutes left, while Eric Dier was an unused substitute. It means England finish qualifying unbeaten, with eight wins from 10 matches and 26 points on the board, eight ahead of second-placed Slovakia, who pipped Scotland to a play-off berth.
Elsewhere, defender TJ Eyoma played 90 minutes and midfielder Tashan Oakley-Boothe 77 as England Under-17s began their FIFA Under-17 World Cup campaign with a 4-0 thrashing of Chile in India.
Here’s a look at the remaining international action involving our players this week…
Monday 9 October
Ben Davies - Wales home 2018 FIFA World Cup qualifier against Republic of Ireland - kick-off 7.45pm
Japhet Tanganga - England Under-19s away friendly against Slovakia - kick-off 6pm
Tuesday 10 October
Toby Alderweireld and Jan Vertonghen - Belgium home 2018 FIFA World Cup qualifier against Cyprus - kick-off 7.45pm
Hugo Lloris and Moussa Sissoko - France home 2018 FIFA World Cup qualifier against Belarus - kick-off 7.45pm
Vincent Janssen - Netherlands home 2018 FIFA World Cup qualifier against Sweden - kick-off 7.45pm
Heung-Min Son - South Korea friendly against Morocco in Switzerland – kick-off 2.30pm
Josh Onomah and Kyle Walker-Peters - England Under-21s away European Under-21 Championship qualifier against Andorra - kick-off 5pm
Marcus Edwards - England Under-20s home friendly against Czech Republic - kick-off 7pm
Jack Roles - Cyprus Under-19s home European Under-19 Championship qualifier against Azerbaijan - kick-off 1pm
Wednesday 11 October
Davinson Sanchez - Colombia away 2018 FIFA World Cup qualifier against Peru - kick-off 12.30am
TJ Eyoma and Tashan Oakley-Boothe - England Under-17s FIFA Under-17 World Cup Group F match against Mexico in India - kick-off 12.30pm
Saturday 14 October
TJ Eyoma and Tashan Oakley-Boothe - England Under-17s FIFA Under-17 World Cup Group F match against Iraq in India - kick-off 3.30pm.