Despite winning five Premier League titles with United, the Brazilian midfielder was often criticised for his weight and inability to complete 90 minutes.
And Owen says his 'Brazilian attitude' inhibited him from doing the necessary work off the pitch in order to keep in peak physical condition.
"Without being too general, he'd have that Brazilian attitude," Owen told Joe. "He was a pretty relaxed guy, maybe too relaxed at times. He loved being out there with a ball at his feet but he did not bother about weights, or anything really. Him getting back from injuries was often a slow process.
"He was a really good player but if he had that driven mentality, he could have been great."