The GM couldn't offer any assurances Crosby would be ready to play by the Oct. 6 start of the upcoming NHL season and reiterated the superstar wouldn't be brought back until he was symptom-free, The (Toronto) Globe and Mail reported.
"We'll have to wait a month from now to see where he is at training camp," Shero told reporters after a report had surfaced that Crosby wouldn't be healthy by the opener.
Shero said he spoke to Crosby at his Nova Scotia, Canada, home during the weekend and was told his concussion symptoms were still present.
"I think he's had some symptoms on and off, depending on how hard he's pushed himself" in workouts, the GM said.
Crosby missed much of last season after being pulled from the lineup Jan. 5.
Neither Crosby nor his agent, Pat Brisson, could be immediately reached for comment, The Globe and Mail said.