The Belgian has had a difficult start to the Premier League season, failing to register a single goal or assist in six matches so far.
His form over the course of the two previous seasons has not been much better, having netted just four goals in 48 appearances.
And Salako, who scored 22 goals in 215 league appearances at Selhurst Park from 1986 to 1995, has expressed his outrage at reports that Benteke could be offered a new deal.
“There is talk of Benteke getting a new contract and I am just flabbergasted!,’ Salako said.
“The lad was incredible at Aston Villa – he was a beast. He also went and did well at Liverpool for a while, but then he got injured and I think he has struggled.
“But what has happened over the last two or three years of him at Palace – and I don’t like digging him out – he’s been awful.
“I really feel for the lad to a point because he just can’t do it. It’s like he’s got his boots on the wrong feet.
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