Former Premier League referee Dermot Gallagher has spoken up on two controversial incidents during the old firm derby.
Neil Lennon's side beat Rangers 2-0 in an away match to lead the Scottish Premier League table.
McGregor and Jack have both been involved in tackles against Scott Arfield and Boli Bolignoli.
"There's a few of these. It goes in as low, and hard from McGregor. The referee actually plays on, I think if he stops play he'll give a yellow card." Gallagher wrote.
"With Jack, It's a yellow card at best. He's gone in hard. Both players are committed, it's inevitable they're going to come together. He even gets a little touch on the ball." he added.
Source - Sky Sports