Henderson paid tribute to the 35 year-old when signing his new contract this week.
“Millie is an example to everyone in the dressing room and a big example to the younger generation as well," Henderson said. “He's a little bit of a throwback to the old school and I quite like that from Millie.
“He's very dedicated and professional, as we all know. He's great to have around the training ground. But he's a top player as well and I think people forget that, even though he might be the age he's at now, he could continue to play for another two, three, four years really in terms of his physical shape.
“So it's down to him what he wants to do. But every time he played last season – I know he's recovering from a little injury now – but even pre-season, last season when he played in the games, he was at the top level.
“You don't really see it drop off. And hopefully he can continue on that path for the next few years, definitely."
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