Cattermole’s current contract with the Black Cats expires at the end of the season.
The Black Cats are expected to hold talks with the midfielder about an extension.
“Cattermole has been excellent since I came to the football club – and he may well have been before, I don’t know about that,” O’Neill told the Sunderland Echo.
“He’s 24 and he’s the captain of the side. Sometimes he needs to keep his discipline better because over the course of the year I expect he’ll pick up a couple of silly bookings.
“I don’t want to build him up too much though – particularly as he has a contract to sign here!”
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.