His side remain fourth in Group D – 5 points off the leaders – after a 1-1 draw with Scotland in Dublin.
O'Neill says the result places extra importance on their upcoming fixtures.
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England round off a weekend of Euro 2016 qualifiers for the home nations later.
Roy Hodgson's men can make it a season unbeaten if they avoid defeat in
Slovenia in Group E.
Scotland kept alive their hopes of progressing with a 1-1 draw against the
Republic of Ireland in Dublin.
They're now 3 points behind Group D leaders Poland, with Martin O'Neill's men
back in fourth place.
Northern Ireland remain second in Group F after drawing 0-0 with
top-of-the-table Romania in Belfast.
