The Post’s Drew Loftis evaluates all the relevant fantasy football news from Week 1 of the NFL season.

Be happy

Adrian Peterson, RB, Washington Redskins

Derrius Guice reportedly could miss time with a new right knee injury, not the same one that had a torn ACL last season. Peterson, a healthy scratch in Week 1, is in line to fill in again. You’ll get volume, not efficiency.

Raheem Mostert, RB, San Francisco 49ers

Starter Tevin Coleman left Sunday’s opener with an ankle sprain. That opens the door for Mostert to get work in a committee that includes Matt Breida. Mostert outperformed Breida in Week 1.

John Brown, WR, Buffalo Bills

Encouraging volume – 10 targets, seven catches, 123 yards and a TD. Plus, QB Josh Allen can buy time for the speedster to get open.

Mark Andrews, TE, Baltimore Ravens

A team-high eight targets. He caught every one, for 108 yards and a score. A great waiver target at a shallow position.

Be worried

Cam Newton, QB, Carolina Panthers

Not running or throwing deep like he did in the past. But still has habits of holding the ball too long and throwing way off target. Have an alternative at the ready each week.

Todd Gurley, RB, Los Angeles Rams

Almost a 50/50 split with Malcolm Brown. He didn’t get goal-line carries. Wasn’t involved in the passing game. Seemed to lack the explosiveness we’ve seen. Big, flashing warning signs here.

David Montgomery, RB, Chicago Bears

We consider this a temporary issue. It might take a few weeks, but expect the rookie to absorb most of Mike Davis’ work, eventually. Good time to buy low.

Phillip Dorsett, WR, New England Patriots

Two TDs on just four targets. And oh, remember a minute ago when we were talking about the upcoming arrival of WR Antonio Brown. Good luck getting four targets after that, Phillip.