Noah Syndergaard has been shut down for six weeks with right elbow inflammation.

"It's big. We were just counting on him being here a month from now," Luis Rojas said. "This happening is tough. ... We pray that he can pitch for us this year."

Rojas said there was no structural damage to Syndergaard's UCL.

On Tuesday, Syndergaard left his second rehab start following his recovery from Tommy John surgery after one inning (16 pitches) as a precautionary measure due to soreness in the elbow. He was scheduled to throw at least four innings for Class A St. Lucie.

Nick Senzel is scheduled to have knee surgery Friday and could miss four to six weeks, according to the Cincinnati Reds.

Senzel, who began the season as the center fielder before moving to third base, has been on the 10-day IL with left knee inflammation since Friday. He hasn't played since May 17.

The New York Yankees will be without Corey Kluber for at least two months because of a right shoulder injury.

Kluber was pulled after three innings Tuesday against the Toronto Blue Jays. He tossed a no-hitter last week.

An MRI on his ailing shoulder revealed a subscapularis strain, which is expected to keep Kluber from throwing for at least four weeks, followed by at least four weeks of rehabilitation.

Aaron Boone said he doesn't believe the no-hitter caused Kluber's injury. Kluber called the whole situation "frustrating" Tuesday, saying he felt some tightness in the shoulder warming up, but it's unclear what caused the injury.

Atlanta Braves outfielder Marcell Ozuna will miss about six weeks after he fractured his middle and ring fingers on Tuesday night.

"If there is a good thing, there's not a surgical process," Brian Snitker said.

Ozuna, 30, injured himself sliding into third base in a game against the Boston Red Sox.

The Philadelphia Phillies have placed Bryce Harper on the injured list with a bruised left forearm.

The move was made retroactive to Sunday.

Harper, who is in an 0-for-16 slump, was held out of the Phillies' lineup for the past two games.

The outfielder leads the team with a .489 slugging percentage, including 15 extra-base hits and seven home runs, but the slump has dropped his OPS to .884.

Corey Kluber left his start against the Toronto Blue Jays on Tuesday night after just three innings with right shoulder tightness.

Kluber received a routine physical exam Tuesday night, and he will be further evaluated Wednesday.

"There is always concern when a starting pitcher comes out like that," Aaron Boone said. "His physical exam was pretty good tonight. Hopefully, we'll get some answers tomorrow, but it was just something he couldn't work through."

The New York Yankees right-hander was pitching on five days' rest after tossing a no-hitter last week at the Texas Rangers, said his arm felt "kind of heavy."

The Cleveland Indians have placed Zach Plesac on the injured list because of a non-displaced fracture of his right thumb.

The 26-year-old suffered the injury while "rather aggressively ripping off his shirt" and catching his thumb on a chair in the locker room Sunday, according to Terry Francona.

Plesac started Sunday's game against the Minnesota Twins at Progressive Field, allowing five runs in 3 2/3 innings.

Jacob deGrom is on track to rejoin the New York Mets on Tuesday.

The right-hander has been on the injured list since May 11 with tightness in his right side and lower back.

"Everything looked good," Luis Rojas said. "We're still going to monitor the rest of today and tomorrow, but he is on track."

Miles Mikolas was placed on the 10-day injured list Sunday, a day after leaving his first Major League start since the 2019 playoffs with forearm tightness.

The St. Louis Cardinals activated the right-hander Saturday for his first start since the 2019 NLCS. He missed last season after flexor tendon surgery, then hurt his pitching shoulder in his first bullpen session of 2021.

Mikolas, 32, allowed three hits in four innings, struck out three and walked one, allowing one run Saturday against the Chicago Cubs.

The New York Mets have placed Taijuan Walker on the injured list with tightness in his left side.

Walker lasted just three innings in his start against the Atlanta Braves earlier this week.

On Tuesday, the Mets said Walker's MRI showed no structural problem. Luis Rojas said the Mets "want to see the mechanics" when Walker pitches. Rojas said Walker's difficulty may be related to his windup and delivery.