Facing division rival Minnesota with an NFC North lead on the line and without several starters on offense and defense, Sunday’s game against the Vikings should’ve been a defining moment for Bears QB Mitch Trubisky.

This was Trubisky’s opportunity to seize control of the offense against a Vikings defense that was ripe for the taking, especially coming off a confidence-boosting win over the Washington Redskins.

Instead, Sunday’s game was a reminder of one of the frustrating aspects of the former No. 2 overall draft pick. Trubisky, who completed 2-of-3 passes for 9 yards, was injured on Chicago’s first offensive drive.

He was trying to elude Vikings DE Danielle Hunter, who sacked him and forced a fumble. The fumble was negated after a defensive penalty, but the effects of the sack weren’t.

Trubisky fell hard on his left throwing shoulder, where a lot of weight came down on it, and he immediately exited the game with trainers. After a quick look in the injury tent, Trubisky was escorted to the locker room and later ruled out for the remainder of the game.

“I just — I want the kid to do really well,” coach Matt Nagy said, via the Sun-Times. “How many plays was it, six? I’m sure that part is frustrating.”

Nagy wouldn’t elaborate on the severity of Trubisky’s injury when asked whether the shoulder was dislocated or broken, but he doesn’t believe the injury is season-ending.

Trubisky will undergo further testing, and Nagy said he hopes to have some answers as early as Monday or perhaps Tuesday.

Trubisky was coming off his best performance of the season against the Redskins, where he tossed three second-quarter touchdowns. But it was apparent that his confidence was definitely up, and Nagy believed that he was finally on the right track. Until the shoulder injury.

“That part is frustrating because [Trubisky] had a really good week of practice, and every week he’s so excited to get back at it and really get this thing going,” Nagy said. “And so it’s — it happens early on, and now here he is, he’s out. . . . He’s out of the game and now he knows that we’ve got to just see where it’s at.”

In Trubisky’s absence, backup QB Chase Daniel came in and didn’t miss a beat. He was efficient and the Bears’ offense looked crisper against a Vikings defense that isn’t exactly a soft unit.

Daniel completed 22 of 30 passes for 195 yards and a touchdown for a 101.4 passer rating.

But, as we saw last season, the Bears can win with Daniel until they can’t. After Trubisky’s injury to his right shoulder last season — against, who else, the Vikings — Daniel was efficient in a short-week Thanksgiving win over the Detroit Lions. But the following week against the Giants, he was atrocious.

Daniel might be the short-term answer. But there’s a reason he’s a career backup and not a starting QB. There should be no QB controversy in Chicago, although it’s sure to be a hot topic of conversation following Sunday’s win.

The Bears will head to London to face Khalil Mack’s former team, the Oakland Raiders, on Sunday before heading into a much-needed bye week where many banged-up players can get some healing time.

The good thing about Trubisky’s shoulder injury this time? It’s not his throwing shoulder, which hopefully is the break he needed.