Souness was speaking after Liverpool's defeat at Brighton on Saturday.
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He told the Daily Mail: “His best is behind him now, there’s no doubt about that. The first person to know that is yourself, and it happens to everyone.
"I don't see the same sparkle. I think if you're looking for the single biggest reason (for Liverpool’s shaky form), it's because he's not been getting the numbers.
“He's been for six, seven years the Liverpool go-to man. He has completely changed games when it wasn't going their way, and he has scored a ridiculous number of goals every season.
"He’s a great - a Liverpool great - but his best season is behind him.”