A video has emerged of Rangers target Pedro Caixinha congratulating Celtic for their 2015 title win while managing Mexican side Santos Laguna. 

The Portuguese coach is the favourite to be appointed as the next Ibrox boss after Mark Warburton resigned last month.

Santos Laguna's official Twitter page posted a video in May 2015, in which Caixinha salutes his 'Celtic brothers' for their fourth successive Premiership win.

The Hoops have had a partnership with the Liga MX outfit since 2011, the club Caixinha led to three major titles between 2013 and 2015.

"Hello Celtic brothers," he said in the video after the Bhoys wrapped up a fourth consecutive league crown.

“I would like to congratulate you for the fourth win in a row in the Scottish Premier League.

“They just keep coming like that. We keep saluting you and pushing you up.”