The 54-year-old stepped in for regular Greenock goalie guru David Wylie as Jim Duffy's side returned for pre-season training.
Wylie was unavailable due to work commit-ments and Parkhead legend Bonner was on hand to help out an old friend.
Cappielow boss Duffy said: "I've known Pat for 30 years, since we were at Celtic together as boys. I appreciated him coming in and helping out.
"He's a guy who played around 500 games for Celtic and in the European Cup and at World Cups.
"I'm sure the players, particularly Nico Caraux and Derek Gaston, enjoyed working with somebody like Pat with the experience he's got and the character he is."