"He has done a really good job and revived Liverpool's enthusiasm," Ferguson, who won the league 13 times, told British media. "It can happen that big clubs lose it. For two decades, Liverpool changed managers without building their own identity.
"You can now well and truly sense that you have to count them in this year. You can see Klopp's dedication on the sideline, I'm convinced his work in training is similar. He's a strong personality. That's absolutely vital at a big club.
"I'm worried about him because the one thing United don't want is Liverpool to get above us."
Liverpool face Crystal Palace (11th) at Selhurst Park on Saturday.
(Reporting by Shravanth Vijayakumar in Bengaluru; Editing by Peter Rutherford)
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