Speaking with Inside United, Rooney revealed he is keen to assist Januzaj with his development.
"I've stayed out after training with Adnan a few times," he said.
"Even just working on free-kicks and crossing. It actually benefits me as well and it benefits him.
"I am trying to help him get better and better, which I feel he is doing, and I think young players need to practise all the time, especially coming into the side. Senior players also need to keep practising to stay on top of their game so it works for both of us."
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