WASHINGTON -- One injured member of the Mets’ rotation is ready to return. Another is not, leaving the Mets without a fifth starter.

Steven Matz declared himself ready to go after throwing a 45-pitch bullpen session Wednesday at Nationals Park. Manager Mickey Callaway said the left-hander will return to the rotation on Saturday against the Marlins. Matz had been dealing with radial nerve discomfort in his left forearm, costing him two starts.

“I’m really happy,” Matz said. “The trainers have been really happy with the progress. So I should be ready to roll for whatever’s next.”

Fifth starter Jason Vargas is also mostly healed from the left hamstring tweak he suffered earlier this month. But the Mets want to see Vargas make a rehab start this Sunday for Double-A Binghamton, after which they figure to activate him.

That leaves the Mets without a starter for their series opener Monday against the Nationals at Citi Field. Wilmer Font has made two consecutive rotation turns in that slot, but is 0-1 with a 9.95 ERA in those games. Callaway mentioned Drew Gagnon, who has fired 5 2/3 shutout innings out of the bullpen since rejoining the Mets late last month, as a candidate. But the manager also said he is wary of removing Gagnon from a role in which he has been successful.

“We’ll have to see,” Callaway said. “I think that we have options. I thought that Drew threw the ball pretty well last night. So we’ll continue to talk about it, discuss it, and we’ll see where we’re at when the time comes.”

Gagnon started once for the Mets last summer, and was 2-0 with a 0.51 ERA in three April starts for Triple-A Syracuse.

“I just try to stick to what I’ve been doing,” he said.

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The Mets announced Thursday that Jerry Seinfeld, Keith Hernandez and “Soup Nazi” Larry Thomas will reunite at Citi Field on July 5 for “Seinfeld Night,” celebrating the 30th anniversary of the show’s pilot episode.

“Two of my favorite things in all the world are the comedy arts and my New York Mets,” Seinfeld, who has appeared in the Mets’ SNY booth in the past, said in a statement. “This is one moment that I am very happy to have my ‘Worlds Collide’!”

The Mets have several in-game events planned, including a Seinfeld trivia quiz and a bobblehead giveaway. Tickets are available at Mets.com/Seinfeld.