The former Manchester United manager delivered a team talk to the European group in Scotland last night before the start of their showdown against the USA later this week.
When explaining why he recruited Ferguson, McGinley said: "I wanted him in there because I knew the banter would be good.
"He connected with the caddies and their sense of humour. I was upstairs but I could hear the laughter. He had some very powerful messages and was relating them to football."
The tournament, which was won by Europe in Medinah in 2012, will get underway at Gleneagles on Friday.