He told TMZ: "I just want to say to Ryan, I am so sorry I didn't call you back. Dude, first of all I don't even have your number. When I see you at the gym, you know which gym, let's finally exchange numbers and if we ever need a sixth Backstreet Boy I will call you. He can sing, Ryan can sing his ass off."
McLean then went on to praise Gosling's many talents and admitted his wife Rochelle Karidis - who gave birth to the couple's first child in November - is "obsessed" with the Notebook star.
He said: "Not only are you a talented actor and a handsome man but a great singer. My wife is obsessed."