PEDRO Caixinha might have regretted asking his players to be physical in today's clash with Celtic after coming on the receiving end of a hefty challenge from winger Josh Windass.

In the opening stages of Saturday's Old Firm clash at Ibrox, the wide man was knocked off the ball by Hoops defender Mikael Lustig and wiped out his boss on the touchline.

The Portuguese saw the funny side, giving his player a pat on the back before ushering him back onto the pitch. 

The 23-year-old has scored one goal in eight appearances for the Light Blues this season.