The SPFL have advised that the fixture details for the Premier Sports Cup quarter-final between Partick Thistle and Celtic won't be confirmed until the end of the month.
The decision has been taken to delay the fixture confirmation for both the matches involving Celtic and Rangers in the quarter-final of the cup competition due to European football involvement.
Both Glasgow clubs are in the Champions League play-off round and will either advance to the league phase of the competition or drop into the league phase of the Europa League.
Therefore, the SPFL will wait until the draw for the league phase of UEFA's competitions has been finalised before scheduling the remaining quarter-final ties.
The matches are due to be played over the weekend of September 19-21, with every match to be shown live on Premier Sports or the Premier Player.
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An SPFL update read: "The SPFL has today provided an update on the Premier Sports Cup quarter-finals, following the draw for the last eight of the competition on Saturday evening.
"All four matches will be shown live on Premier Sports or the Premier Player across the weekend of September 19-21, with a place in the semi-finals on the weekend of November 1/2 at stake. The final of the 2025/26 Premier Sports Cup will take place on Sunday December 14.
"The first of the quarter-finals will see 2012 winners Kilmarnock take on 2013 winners St Mirren at the BBSP Stadium, Rugby Park on Friday September 19, while the meeting of Aberdeen and Motherwell at Pittodrie has been confirmed for Saturday September 20, kick-off 3.00pm.
"Fixture details for the remaining quarter-finals – Partick Thistle v Celtic and Rangers v Hibernian – will be announced following the UEFA competition league phase draws at the end of August.
"Broadcast arrangements for all four ties will also be confirmed after the UEFA draws."
Premier Sports Cup last 16 fixtures confirmed
Kilmarnock vs St Mirren - Friday, September 20 - 7.45pm
Aberdeen vs Motherwell - Saturday, Sepember 20 - 3pm
Partick Thistle vs Celtic - TBC
Rangers vs Hibernian - TBC
