Saints were taken apart 44-10 last night by Salford.
Walsh says St Helens have to improve a lot next week or they will be heavily beaten by the Roosters.
“Our attitude was off … they’ll put 80 on us,” he told Fairfax Media.
“They’re a great side, the Roosters, and we have to be 10 times better than we were tonight. And I think we will be.
“Hopefully Robes is a chance. Having a look at Perc, he’s no chance. Robes will be touch and go.”