"He was captain when I was there and tended to lead by example in training. He demanded everybody working hard at all times," said Henderson to the Mail on Sunday.
"You get certain people who are just like that naturally, they want to help as much as they can. He's very vocal on the pitch and will try to get everybody doing their jobs.
"I don't know what went on behind closed doors at Sunderland but he'd be one to ask the questions if there were problems."
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