INGLEWOOD, Calif. — The Jameis Winston Experience is going to last longer than any roller-coaster-riding thrill-seeker will find at an amusement park. 

The Giants fear that Jaxson Dart is going to miss the rest of the season after further testing on his left knee revealed greater concerns than a sprained MCL, The Post confirmed. He was injured four minutes into Monday night’s 28-6 loss to the Rams. 

So, a worst-case scenario puts the fate of what started out as a promising season into the hands of Winston, who hasn’t been a full-time starter since he led the NFL in passing yards (5,109) and interceptions (30) for the 2019 Buccaneers. 

“We have to get back in the win column, and that’s something I feel like we’re going to do,” edge Brian Burns said inside a postgame locker room that still was expecting Dart to return at some point. “If Dart isn’t ready, then we’re behind Jameis. Jameis has done it before, he’s a vet and a winner in this league.” 

If Dart was simply going to miss two to four weeks — the preliminary prognosis — then there were worse times for him to be sidelined than against the softest part of the schedule. 

Winston could be a catalyst in victories against the Titans, Cardinals, Commanders (on the road) and Saints if he plays as well as he did in an overtime loss to the Lions last season (366 yards, two passing touchdowns and a receiving touchdown). 

Or the Giants could lose all of those games, say goodbye to their season and become trade-deadline sellers if Winston plays like he did off the bench (11-for-27 for 111 yards) against the Rams. 

“I don’t think you let it derail at all,” running back Cam Skattebo said. “We put our full trust in Jameis. When we get a whole week to prepare with him and get comfortable with him, I think it’s going to be a different story.” 

Week-to-week unpredictability is the reason the former No. 1 pick has spent most of his career as one of the NFL’s highest-profile backup quarterbacks. 

“Jame-o can spin it,” safety Jevón Holland said. “I have no doubt he’s going to go out and ball — same thing he did last year when we played the Lions. I have confidence in the coaches to put a scheme together around the individuals that are playing to be successful — and it’s our job as defenders to give the ball back to our offense.” 

The Giants expressed confidence in Winston by signing him to a two-year, $13 million extension earlier this month. His $6.5 million average annual value ranks No. 32 among quarterbacks, so he is one of the NFL’s highest-paid backups for his good locker room vibes and the experience to be a short-term solution. 

The Cardinals (1-1), Titans (0-2) and Commanders (0-2) all look like teams that could be jockeying for top draft position in 2027. The Saints (1-1) are an upstart threat to win the NFC South, but Winston is a celebrity in New Orleans after four seasons as their backup. 

All four opponents rank No. 14 or worse in total defense after two games. 

“Any time your quarterback goes down, obviously that’s a gut punch to the team,” Winston said. “Just rallying around that and all of us having a fresh week to prepare and go out there and play our best football.” 

Does Matt Nagy’s offensive play calling change if Winston replaces Dart? 

“Obviously, I do some things really, really well, and we’re going to discuss that,” Winston said. “We’re just going to focus on getting better and executing, being efficient and putting ourselves in a better position than we did today.” 

The worrisome part about Winston’s performance was that he was bouncing passes, sailing passes and struggling to feel pressure on his blind side. 

At his best, Winston imitated Eli Manning on the Helmet Catch and evaded a sack to throw the ball downfield to a diving Malachi Fields, who couldn’t hang on. 

At his worst, he underthrew a deep slant to Malik Nabers for an interception in the end zone. 

“The lull that you perceive is the fact that plays aren’t being made,” head coach John Harbaugh said. “That’s where that feeling comes from. It’s not like they got down and that’s why we didn’t execute. We didn’t execute, that’s why there wasn’t energy.” 

The next time that the Giants were in the red zone, Nagy seemed to cast a vote of no confidence in Winston by calling four straight runs (one negated by penalty) from the 11-yard line instead of targeting Nabers. 

Harbaugh and Nagy were second-guessing that play calling before the game ended. 

“We didn’t have answers this week to get the ball in the end zone,” Harbaugh said. 

It seems unlikely that the Giants will find a better starting option than Winston on the street in September. What needs to be reevaluated is whether they want to be one snap away from playing likely practice-squad elevation Jake Haener (39 career passes) if Winston gets injured, too. 

“Absolute faith in all of our players,” Harbaugh claimed.