Doug Melvin is ready to end his semi-retirement and attempt to transform the Mets into a winner, if given a chance.

“I went fishing for a couple of years and I caught one fish, so I am ready to get back into the baseball grind,” the 66-year-old Brewers senior adviser said Tuesday after interviewing with Mets owner Fred Wilpon and COO Jeff Wilpon for the team’s head of baseball operations vacancy.

Melvin is among three finalists for the opening, joining agent Brodie Van Wagenen and Rays senior VP of baseball operations Chaim Bloom. The team is expected to fill the opening by next week, ahead of the GM meetings, which begin Nov. 6 in Carlsbad, Calif.

Bloom is scheduled to interview Wednesday. Van Wagenen interviewed Monday.

Upon stepping aside as Brewers GM in 2015, Melvin, then 63, said the job was probably a better fit for a younger person. But three years on the sidelines have changed his perspective.

“That’s probably how I felt at that particular time, but now that I have taken a little bit of a break from the day-to-day activities, I am energized and excited about the challenges, and I have an understanding about both scouting and analytics,” Melvin said.

“But the second part is managing people, what I enjoy: player development, scouting, helping a manager of a major league team. Dealing with people is really what I like to do.”

Melvin said he would bring a blend of analytics and scouting to the job. When asked about the Mets’ analytics department, which consists of three members — and is among the smallest in baseball — Melvin said it could probably use a boost.

“I don’t know the whole analytics staff, but it can be probably improved upon and maybe staffed up a little bit,” Melvin said, noting that he was a proponent of the shift before it came into vogue, and that in 2010 he foresaw the advent of teams using relievers to start games — an approach the Brewers took this season.

Melvin indicated that if he is hired he would likely retain Mickey Callaway, who just completed his rookie season as manager. Callaway was hired by previous GM Sandy Alderson, who stepped aside in June to battle his recurrence of cancer.

“Mickey, it had to be a very tough situation for him this year, with the health of Sandy,” Melvin said. “John Ricco stepping in did a great job of keeping things together, but the manager came in and it was his first time as a manager and my feeling is he probably deserves a chance to do this again.

“I want to sit down if I get this job and talk extensively with Mickey and see his philosophy in that. But I think he deserves a chance, because he’s been a good baseball guy if you read his résumé.”

Melvin added that he expects to have autonomy in baseball operations and will be allowed to bring in his own personnel.

“There is no doubt that Fred and Jeff are very passionate about owning the New York Mets, and they need to know what’s going on,” Melvin said. “But that is no different than any other ownership group I have dealt with in the past.”

Michael Conforto, Brandon Nimmo and Amed Rosario were players named by Melvin as building blocks, in addition to the Mets’ talented starting rotation. Melvin said the Mets are not in a rebuild mode and should expect to compete in 2019.

And he indicated it’s the Mets, in particular, that appeal to him as he considers a comeback to the GM role. The Canadian-born Melvin was Rangers GM from 1994-2001 and held the same job with the Brewers from 2002-15.

“If there were other opportunities — and I’m not talking to anybody else — but if there were other opportunities, I probably would not have been as interested [in those jobs],” Melvin said.