The Jets got some good news on Tuesday … finally.

Starting quarterback Sam Darnold was cleared to play this week by team doctors after missing the last three games while recovering from mononucleosis. The team announced Darnold will be its starter against the Cowboys on Sunday at MetLife Stadium.

Darnold is not a panacea for all that ails the 0-4 Jets but he certainly will improve their offense, which has been inept in the last two weeks.

“It’s been more than just the quarterback, but anytime you get your starting quarterback back that’s going to help you a lot,” Jets coach Adam Gase said on “The Michael Kay Show” Tuesday. “We had a good few days of practice last week with him in there and I think moving forward that week is going to pay off for us.”

Darnold underwent tests on Tuesday to make sure his spleen had shrunk enough that he can have full contact in the game. Mono commonly causes the spleen to enlarge and puts the person in danger of dying if the spleen ruptures.

Darnold played Week 1 against the Bills, but the Jets believe he was already feeling the effects of the mono. He went 28 of 41 for 175 yards and one touchdown in the 17-16 loss. The 22-year-old was diagnosed three days after the Bills game.

The Jets hoped he could return last week against the Eagles and Darnold took first-team reps on Wednesday and Thursday, but tests on Thursday night showed he was not ready to be cleared by the doctors.

Luke Falk started his second straight game in Darnold’s place. The third-string quarterback was bumped up to starter after Darnold’s diagnosis and backup Trevor Siemian’s ankle injury in Week 2 against the Browns. The Jets offense sputtered with Falk under center.

The Jets are dead last in total offense and several other offensive categories. They scored only one offensive touchdown without Darnold. In the 31-6 loss to the Eagles on Sunday, Falk was sacked nine times and the Jets managed just 128 total yards. The Eagles scored twice off of Falk turnovers.

The biggest hurdle for Darnold now may be dealing with the pressure that will be on him to save the Jets season. He is going to be viewed as a savior, even though the Jets have more issues than just their quarterback play. The offensive line has struggled in pass protection and opening holes for Le’Veon Bell.

During his radio interview on “The Michael Kay Show” on Tuesday, Gase indicated he may not be done making changes to the offensive line. The Jets used two new starters on Sunday against the Eagles, but showed no improvement. They allowed 10 sacks.

“We’re going to just kind of keep moving things around, see who’s healthy, see who’s available, kind of keep working different lineups in practice,” Gase said. “We’re going to look at as many lineups as we need to until we get it right.”

Gase used rookie tackle Chuma Edoga in place of Brandon Shell and put Alex Lewis in the lineup instead of left guard Kelechi Osemele, who is dealing with knee and shoulder injuries.