The young full-backs moved to Old Trafford from Fluminense in January 2008 at the age of 17, though Rafael has seen significantly more first-team action than his sibling.
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"It's not strange but it's different," Rafael told the club's official website. "We're close and I was always together with him but it's been good for us, just to become more mature.
"I used to ask him all the time if I needed something but now I need more of my own mind so I've grown more mature. It's bad because I miss him but it's good to learn more.
"He is always calling me back to say something is not good [about my game].
"It's always been like this. He is back in training now and maybe, when he plays again, we'll keep doing this."