The 49ers will have wide receiver Brandon Aiyuk and left tackle Trent Williams available to them against the Jets on Monday night, but they will be without running back Christian McCaffrey.

McCaffrey said Friday he had no doubts he would play and there was plenty of optimism from head coach Kyle Shanahan and general manager John Lynch, but McCaffrey was still questionable and remains on the team’s inactive list. McCaffrey missed most of the summer with a calf injury and is also listed with an Achilles injury.

Jordan Mason, Patrick Taylor and Isaac Guerendo are the available backs for the Niners.

Offensive lineman Ben Bartch, quarterback Joshua Dobbs, defensive end Yetur Gross-Matos, safety Talanoa Hufanga, cornerback Darrell Luter and linebacker Dee Winters are also out for the home team.

The Jets are without offensive lineman Max Mitchell, running back Israel Abanikanda, tackle Carter Warren, defensive lineman Leonard Taylor, tight end Brendan Bates, defensive lineman Eric Watts and cornerback Jarrick Bernard-Converse.