Showbiz
Rex Features
It was recently reported that the Entourage star was unhappy that Lucas was spending time with her Transformers co-star. The Australian actress was a passenger in LaBeouf's truck when it crashed last month.
However, Grenier insisted that he and Lucas were never serious, saying: "I thought it was funny that suddenly there was a big scandal, because since when were we dating? First of all, we don't give each other those labels - it's more subtle than that. She and I have a very open communication. We're friends with common interests.
"Secondly, love and relationships are complicated. No-one could ever get it right in a four-line sentence."
He added: "I'm not married. We're young in Hollywood and having fun."
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