Bolt was among the crowd as United defeated Villarreal in their second Champions League group stage match.
Speaking to the Manchester Evening News following the match, Bolt said: "He [Ronaldo] helped to build the club and it was wonderful when he was here, the energy. So I'm happy he's back.
"I just saw Alex Ferguson inside and I thanked him for bringing Cristiano back, so I'm happy about it."
Bolt, a self-confessed huge United fan added: "I'm happy to be here, I haven't been back to Old Trafford in a while, so I'm just happy to be here in the stands with everybody to watch the game."
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