The Celtic boss is optimistic regarding his former team's chances.
Newcastle United have made some fantastic acquisitions already this summer.
The Liverpool defender has not played a game since April.
Rangers boss Mark Warburton brought Barton to Ibrox from Burnley this summer - prompting excitement of a Scott Brown clash.
West Ham United have swooped to sign Manchester United's Ashley Fletcher.
Newcastle are reportedly considering a move for Stoke City striker Peter Crouch.
Celtic lost 1-0 to Lincoln Red Imps in Gibraltar on Tuesday night.
The Leeds United goalkeeper was sent home from their pre-season trip to Dublin.
Jordan Botaka says he has been impacted by the arrivals of two new Leeds stars.
Celtic manager Brendan Rodgers is expecting further additions in the next two weeks.