Both have battled across the park in numerous derbies and fought for leagues and cups across different seasons.
However, they have also appeared together in Scotland at international level.
In the current squad selected for matches against Cyprus and Spain, McGregor and Jack are two of only three players to ply their trade north of the border.
And the Ibrox midfielder spoke about why he enjoyed playing with the 29-year-old.
Tell Sky Sports“We have a great bond through the number of games Callum and I have played.
“Obviously I don’t know what the manager is going into, I don’t know what the line-up or personnel will be until we meet obviously.
“There are five or six midfielders in the squad. You look at it and you think anybody can play, anybody can step in.”
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Meanwhile, Celtic defender Anthony Ralston has been recruited into Scotland’s latest squad.
As expected, Dominic Hyam has also joined forces alongside Steve Clarke.
The Blackburn Rovers centre-back earned his first international call-up at the age of 27.
The defender has represented Scotland at youth level but has never been considered for a senior call-up yet.
His impressive form for Rovers as they looked to be promoted to the Premier League through the Championship Play-offs caught Clarke’s attention.
Ralston, who has struggled to get game time for Celtic this season, was also called up for the matches against Cyprus and Spain.
The couple were brought into hiding after Jack Hendry was forced to withdraw due to an injury.
While Hyam was called up to his first Scotland team, Ralston has been a regular feature in the national team setup over the past eighteen months.
His transformation at Celtic Park under the guidance of Ange Postecoglou brought him international recognition from Clarke.
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