49ers rookie wide receiver Ricky Pearsall was placed on the non-football injury list Monday after he was shot in the chest Saturday during a robbery attempt in San Francisco.

With the designation, Pearsall will be sidelined for at least four games.

Pearsall, 23, had been listed as "serious but stable condition" on Saturday and upgraded to "fair condition" Sunday before being released from San Francisco General Hospital and Trauma Center.

Pearsall's mother said Sunday in a social media post that the bullet exited her son's back and missed his vital organs, adding that he was "extremely lucky."

The suspect, a 17-year-old male from Tracy, California, was arrested Saturday, according to San Francisco Police Chief William Scott.