Ibrox side Glasgow Rangers lost Billy Gilmour last month, and the Celtic supremo suggests it's a "big risk" by the player.
Brendan Rodgers has penned a new long-term contract with Celtic.
Ibrox outfit Glasgow Rangers recently appointed Pedro Caixinha as their new manager.
Celtic chief executive Peter Lawwell has made a rather bold claim about the club.
Here is some of the latest news involving Celtic and Glasgow Rangers less than a month before the transfer window opens.
Celtic have dominated the Scottish Premiership this season, but have struggled in the Champions League.
Ronny Deila parted company with Celtic at the end of the 2015-16 season.
Brendan Rodgers was appointed the Celtic manager in the summer.
Barton claimed that the Scottish Premiership champions made a move for him before he completed his switch to Glasgow Rangers.
Brendan Rodgers has been appointed the new Celtic manager.