Ex-NFL star Marcellus Wiley is taking a firm stance on who should take over for the Los Angeles Chargers ... telling TMZ Sports he thinks Bill Belichick should NOT be the next head coach.
The Bolts job is arguably the most attractive opening in the league right now ... and many are speculating they could land a big fish like the former Patriots legend or Michigan's Jim Harbaugh if he chooses to make a return to the pros.
We asked the TV personality about those two names specifically ... and while he considers Belichick the greatest coach of all time, he says Harbaugh is the right guy for the gig.
"It's gonna be tough with the Chargers, obviously," Wiley said at LAX. "We're looking for a coach that we can look into the future with. With Belichick, how far are you going to look into the future? I don't know."
Wiley points out there's still a debate whether Belichick or Tom Brady was more responsible for the Patriots' six Super Bowl wins ... and his style of coaching may not resonate with the locker room.
Harbaugh -- who's fresh off a national championship with the Wolverines -- hasn't announced whether he will be back in Ann Arbor next season ... but Wiley thinks his postgame comments mean he's as good as gone.
As for his former team, Wiley -- who played in San Diego from 2001-2003 -- thinks they're an easy fix under Harbaugh ... making him the perfect guy to replace fired coach Brandon Staley.
"With Justin Herbert, he's top 5 talent," he added. "He just needs everybody else. First, he's gotta stay healthy and then everybody else just kinda stay healthy and stay on page. With Staley, it was fun ... but a little too much gambling. It started to cost us. People stopped believing him, the doubt creeped in, then he just lost his way. That's what happens."
"It's a tough situation. It's delicate. I think Harbaugh would do it the best no matter who you talking about."