FORT MYERS, Fla. — Red Sox lefthander Eduardo Rodriguez has what the team is calling a subluxation of his right kneecap and will be out at least three days.

The 22-year-old Rodriguez was injured during a defensive drill Saturday and had an MRI on Sunday morning. In simple terms, his kneecap briefly popped out of place before going back in.

“As far as any kind of structural damage, there isn’t any,’’ manager John Farrell said. “Cartilage is fine; the ligaments are fine. There’s some swelling. He’s going through some treatment.’’

Rodriguez is not wearing a brace but is favoring his knee as he walks. The Red Sox will not have him throw until the swelling is down.

“As far as anything beyond the 72 hours, we have to get to that point first,’’ Farrell said.

Rodriguez left the complex in a car that pulled up to the clubhouse door.

Rodriguez is lined up to be the third or fourth starter and that could still be the case if he returns within a week. The Red Sox do not start their spring training schedule until Wednesday.

If Rodriguez cannot get into a game by the second week of March, the Red Sox would have to consider altering their plans.

“The 72 hours will tell us if he’s ready to get a ball back in his hands,’’ Farrell said. “That’s where we’re at.’’

Doubleheader day

The Red Sox host Boston College and Northeastern on Monday. The two seven-inning games begin at 1 p.m., with a 45-minute break between.

Steven Wright will start the first game against BC with Matt Barnes, Pat Light, Williams Jerez, and Roman Mendez scheduled to pitch in relief.

Sean O’Sullivan faces Northeastern with Will Cuevas, Heath Hembree, Kyle Martin, and Danny Rosenbaum in relief.

The Sox will use their regulars in the first game outside of David Ortiz and Rusney Castillo. Ortiz wants more work in the batting cage before getting into a game, and Castillo is getting back in condition after missing five days with the flu.

Brock Holt, Travis Shaw, and Deven Marrero are scheduled for the second game.

Boston College will start Justin Dunn, a junior from Freeport, N.Y. The Eagles are 7-0 for the first time since at least 1974. BC beat Villanova, 11-10, in 12 innings, on Sunday.

Northeastern (4-4) will start Brian Christian, a sophomore from Plymouth. It’ll be his second appearance of the season.

Pitching plans

Henry Owens will start the Grapefruit League opener against the Twins on Wednesday. Rick Porcello faces the Twins down the road at their ballpark on Thursday.

David Price threw a session of live batting practice on Sunday. His first start is expected to be on Saturday. The Red Sox play the Yankees in Tampa that day and may prefer to have Price work in a minor league scrimmage rather than take a long bus ride to face a divisional foe.

Either way, Price is eager to get going in earnest.

“I want to go out there and I want to establish myself early,’’ he said.

Pitching on Saturday would line up Price to make six starts in spring training leading up to Opening Day in Cleveland on April 4.

Uehara catching up

Koji Uehara is the only pitcher on the team yet to throw live batting practice. That will be scheduled in the coming days. He is tentatively scheduled to pitch in a minor league game on March 9.

Uehara missed the first few days of workouts with an illness and has been catching up since. Typically, he needs only a handful of games to be ready for the season.

Uehara took part in a pop-up drill Sunday and made a nice catch in foul territory near third base. The infield was shifted to the right side and Uehara went a long way to make the play.

The crowd cheered and Uehara lifted the ball in the air in glee.

Ross still sharp

Lefty reliever Robbie Ross Jr. threw live batting practice and was sharp. He should have a prominent role in the bullpen. Ross appeared in 54 games last season and had an adjusted earned run average of 112. Among Sox relievers, only Uehara was better.

“He’s carrying over what the second half of last year showed. He started for [one season] after two really good years as a reliever [with Texas],’’ Farrell said. “I think it took him the first half of the year to get back to that reliever approach, where it was a more simplified, aggressive attack plan from the mound.’’

Peter Abraham can be reached at pabraham@globe.com. Follow him on Twitter @PeteAbe.