The Hammers and Saints both managed to stay up after gaining promotion and Mackay believes Cardiff can do the same.
"I look at the three teams who came up last time and two of them stayed there," said Mackay. "Both West Ham and Southampton strengthened, as we have, and we still have business to do. If they can do it, I don't see why we can't. For this club to be still in the Premier League a year from now would be massive."
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