Scottish Premiership clubs are to be allowed five substitutions during games this season.
The temporary measure will come into effect with the opening round of fixtures this weekend after being approved by the SPFL.
Clubs will be able to name nine players on the bench and make five substitutions, but play can only be halted for those substitutions on three occasions during the match.
SPFL chief executive Neil Doncaster said: “As excitement builds ahead of the return to competitive action this weekend, I am pleased that the Premiership clubs have approved this resolution which was recommended by the Board.
"Player welfare was at the forefront of our decision to recommend this change and it is vital that we recognise the additional strain being placed on players as we embark on the 2020/21 season.
“We are preparing similar resolutions for the Scottish Championship, League 1 and League 2 and these will be distributed to the clubs in those divisions in due course.”
Rangers kick off their campaign at Pittodrie against Aberdeen on Saturday, with Celtic starting their season at Celtic Park against Hamilton Accies on Sunday.
