Speaking to Entertainment Weekly, Zack confirmed that he had been eyed Joe Manganiello for the part.
“Joe’s a great guy. I really liked him,” he said. What happened to sway his decision? ”It was about seeing a quality that inspires this inexplicable, mysterious, cool emotion that says, ‘That’s my guy.”’
At the time, Joe was a fixture on the popular series True Blood.
Source: justjared.com