Talking to NBC Sports Bay Area's Matt Maiocco, San Francisco coach Kyle Shanahan shared what Mac Jones has to do for the 49ers to win vs. Texans.

Purdy won’t start. Coach Kyle Shanahan said that duty still belongs to backup Mac Jones when the 49ers (5-3) visit the Giants (2-6) at the Meadowlands Sunday (CBS, 10 a.m.) But Shanahan left open the possibility that Purdy could be active and be No. 2 ahead of Adrian Martinez. He didn’t commit to it, however.

San Francisco 49ers quarterback Mac Jones speaks candidly following the 49ers’ loss to the Houston Texans in Week 8 at NRG Stadium.

Jones (knee/knee) practiced in full Wednesday, Eric Branch of the San Francisco Chronicle reports.

A Brock Purdy vs. Mac Jones argument is missing the point. The 49ers need both to have a shot at the playoffs.

Quarterback Brock Purdy has been ruled out for his third straight game for the San Francisco 49ers due to a toe injury. Mac Jones will start against the Atlanta Falcons.

Mac Jones -- on the back of a multi-touchdown passing game -- and the San Francisco 49ers play the New York Giants in Week 9, on Sunday at 1 p.m. ET. To be specific, he passed for 193 yards and two TDs. Game Time: 1 p.m.

But at halftime, the Texans led only 16-7 after San Francisco took advantage of former Alabama standout Brian Robinson Jr. ’s 46-yard kickoff return. With 25 seconds left in the first half, Jones threw a 17-yard touchdown pass to tight end George Kittle.