Torres is expected to be moved on by Chelsea in the summer.
And Murphy told talkSPORT of his former Reds teammate: "He will never be back to that player he was at Anfield.
"His confidence just dropped. And it's got worse and worse.
"He's never been technically that brilliant. I remember when he was doing well at Liverpool taking to a couple of the lads there and they were a bit negative about his technical ability and what he didn't have, rather than what he did have, which was pace and power.
"But the rest of his game has never been perfect, far from it, in fact.
"There was a spell at Liverpool when he was unplayable because of his power and his pace, but once he lost that and his confidence went he became reliant on his technical ability, which he's not very good at - his hold up play, his passing, his decision making, which is terrible."
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