Ashton, 23, has scored nine tries in as many matches for England since converting from Rugby League in 2007, including six in two games at this yearÃ¢â‚¬â„¢s Six Nations championship.
Cueto said: “Whenever you do your analysis on the teams you come up against you pick out the threats and without a shadow of a doubt, teams will be looking at Ashy.
“He has scored six tries in two games and is the out-and-out threat with England at the minute so he will be put under a lot of pressure. Teams start to target you and they will maybe throw extra defenders [at Ashton].”
However, the Sale star believes that the possibility of France putting all their efforts into stopping Ashton will only play into the hands of Martin JohnsonÃ¢â‚¬â„¢s side in next Saturday’s clash.
“It is not a case of shutting Ashy down and we stop winning,” Cueto added. “If you throw two men at Ashy then there is going to be a gap somewhere else and someone else will exploit it.
“Shontayne Hape and Mike Tindall in the middle were looking strong and busting through tackles and Ben Foden at the back is unsung at the minute.
“We have people like Ben Youngs and Toby Flood at nine and 10 – I could go through the whole team and talk about threats.”
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BIOGRAPHY: Marcus Rashford