Jordan Montgomery, who was signed by the Arizona Diamondbacks in late March amid a soft free agent market, has dropped Scott Boras as his agent and signed new representation, sources told ESPN's Kiley McDaniel on Thursday.

Montgomery has signed with Wasserman's Joel Wolfe and Nick Chanock, sources told ESPN.

Arizona Diamondbacks shortstop Geraldo Perdomo will have surgery on Monday to repair a torn meniscus in his right knee.

Perdomo, 24, was placed on the 10-day injured list before Sunday's game against the Atlanta Braves.

Diamondbacks manager Torey Lovullo said he wasn't given a timeline of how long Perdomo will be out but said the normal recovery time for the surgery is six to eight weeks.

The Miami Marlins acquired infielder Emmanuel Rivera from the Arizona Diamondbacks on Tuesday in exchange for cash considerations.

The Marlins designated infielder Jacob Amaya for assignment to open a spot on the 40-man roster.

Left-hander Jordan Montgomery and the Arizona Diamondbacks are in agreement on a one-year, $25 million contract that includes a vesting player option for a second season, sources told ESPN on Tuesday night, bolstering the National League champions' rotation with the postseason standout from the team that beat them in the World Series.

The deal, which is pending a physical, ends Montgomery's free agency two days before Opening Day and could include a second-year player option at $20 million if Montgomery makes 10 starts. The option would be for $22.5 million if Montgomery reaches 18 starts and $25 million at 23 starts, sources said.

Arizona Diamondbacks closer Paul Sewald will start the season on the injured list because of a strained left oblique.

Torey Lovullo said the strain was a Grade 2, meaning the right-hander could miss several weeks.

The Diamondbacks acquired Sewald in a trade with the Seattle Mariners last summer.

Sewald had 13 saves down the stretch in the regular season and six more in the playoffs for Arizona.

The market for Jordan Montgomery "has finally hit, and it's getting competitive," according to a report.

Jim Bowden reports that Montgomery has long-term contract offers from two teams. Bowden adds that a signing is "probably going to happen this week." 

Montgomery has been linked to the Boston Red Sox, New York Yankees, Baltimore Orioles and Arizona Diamondbacks.

Longtime major league outfielder Kole Calhoun is retiring, he announced Friday night via Instagram.

"The day has come that I announce my retirement from Major League Baseball," Calhoun, 36, began his post. "I know how extremely lucky I am to even be able to say that. Baseball was always my dream, and to make that my reality fills me with gratitude.

"I have loved this game since I can remember so making this announcement weighs heavy on my heart. This day comes for all players eventually and I can honestly say that I have given this game everything I have and I walk away with no regrets."

The Arizona Diamondbacks have signed veteran infielder Elvis Andrus to a minor league contract with an invitation to big league spring training, the team announced Sunday.

"There's nothing that's been promised to him," Torey Lovullo said. "I told him to go out and play your game and let it fall where it may. What he will get are some opportunities to show us what he can do. That excites us."

The Arizona Diamondbacks have been in Chase Field since their inception in 1998.

The team's current lease runs through 2027. The Diamondbacks would like to make renovations to the stadium that will cost $400-500 million and they'd like to use public financing to fray some of the cost.

Diamondbacks ownership claims to be willing to put up "hundreds of millions" of dollars toward the final cost, but also wants some local help.

"There is likely to be, in time, an expansion of our sport to a couple of additional cities. Cities are letting MLB know their interest; their interest in getting a team is specific. They would be happy with a brand new franchise, but they would certainly be very happy, you know, with, frankly, a successful, existing franchise," managing partner Ken Kendrick said.

"It's not where we are spending time or energy. We may run out of time in Phoenix. We hope that won't happen. We're hard at it; we're continuing to have meetings. We've ramped up the dialogue in every way that we know how and we'll continue to do that."

The renovations, Kendrick said, could take up to four years, including seating and family areas, as well as building up the surrounding land.

Less than 24 hours after saying he was still looking to add another bat, D-backs GM Mike Hazen did just that as the team agreed to terms with free-agent outfielder Randal Grichuk on a one-year contract with mutual option for 2025, a source told MLB.com on Saturday.

The club has not confirmed the deal.

Grichuk will earn $1.5 million as a base salary this year and the option for 2025 is $6 million with a $500,000 buyout.