Rangers manager Pedro Caihinha was knocked to the ground by his own player during the Old Firm clash at Ibrox today. 

Celtic player Mikael Lustig flew into Josh Windass who then managed to tackle Caixinha to the ground.

Pedro Caixinha was unharmed and brushed himself off before helping his player to his feet.

Rangers were awarded a free kick for Lustig's fowl before play continued. 

Both teams saw the funny side and the jokes about Caininha's fall have already begun flooding social media.

Glasgow Times:

Credit: Facebook

Mikael Lustig even posted a picture of the tackle alongside an emoji of ten pin bowling. 

Glasgow Times: