SANTA CLARA — Brock Purdy’s work in Wednesday’s practice comes with a different caveat than past sessions the past month: The 49ers intend to start him Sunday at Arizona, if all goes well.

That is The Purdy Plan, as outlined by coach Kyle Shanahan before Wednesday’s session.

“If he takes a big step forward this week like he did last week, he should have a good chance to play,” Shanahan said.

Purdy still will be classified as limited, and so will be wide receiver Ricky Pearsall in his first practice since a Sept. 28 knee injury.

As Purdy and his troublesome toe prepare to return from a six-game hiatus, the 49ers will put him in “aggressive” situations, although it will be “not exactly how it normally is,” Shanahan said.

Purdy originally injured his right foot’s big toe in the season-op

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