Shearer was reacting to United's hard-fought 1-1 draw at Chelsea.
"I said a few days ago, maybe a week or two ago, that the players had stopped running for Ole," he told Match of the Day. "That was the case.
"There's no doubt that the manager has gone in there, whatever he's said has worked.
"Whatever he's been doing on the training ground and the players have responded to that and they've responded to a new voice."
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