They are sixth in the league on 39 points, trailing second-placed Liverpool by five points.
"I think with Mourinho going there, he's going to be a great manager," Rush told Sporting News.
"When you've got a great manager like Mourinho, he'll bring out the best of the players ... That's something we should all be worried about, when you've got a manager like Mourinho who knows exactly what to do."
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(Reporting by Shravanth Vijayakumar in Bengaluru; Editing by Peter Rutherford)
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