McCourt is a hugely talented footballer but criticisms of his work-rate have led to him being described as a "luxury player" by some commentators.
The Celtic player's club-mate Niall McGinn and Sunderland's George McCartney are both unavailable for the game in Maribor because of injury.
Wolves youngster Jonny Gorman also retains his place after being included in the squad for the summer tour and the friendly against Montenegro.
Gorman, who is still at school, is still to appear for the Wolves first team.
Fulham defender and squad captain Aaron Hughes returns after injury.
However, Andrew Little and Ryan McGivern have been left out after being included in the squad for the recent friendly against Montenegro.
For players to miss games through indiscipline, that's something I can't live with
Nigel Worthington
Northern Ireland boss Nigel Worthington defended his decision to again omit McCourt.
"Paddy is a wonderful footballer. On the ball he can do this, that and the other and I've spoken to Paddy, so he knows what he needs to do," added the Northern Ireland manager.
"Great Northern Ireland players such as (George) Best, (Norman) Whiteside, (Gerry) Armstrong...they have all worked very hard with the ball and without (the ball).
"With all the craft that Paddy has, if he can get the graft side, the work ethic, what a great player he would be for us."
Worthington insisted that the Northern Ireland squad includes "five or six players capable of scoring outstanding goals".
Asked about Kyle Lafferty's weekend sending-off for Rangers, which came after a silly booking in the recent friendly against Montenegro, Worthington said that he would "not tolerate indiscipline".
"We must have a full complement of players. For players to miss games through indiscipline, that's something I can't live with."
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