What is McCowan's advice to 17-year-old McArdle?

Luke McCowan revealed he has imparted some sage advice to Sean McArdle following the 17-year-old's breakthrough to the Celtic first team.Midfielder McArdle has made his first two appearances off the bench in the past week as Celtic defeated Hibs 3-1 and Aberdeen 5-1."He's quiet," McCowan said. "It was funny, I was saying to him... he was behind me in one of the signing sessions and obviously you just scribble your name, your number. He wrote his full name, just on a print."And I said, 'Sean, you