On Monday afternoon, standing on a patch of grass under some palm trees among a throng of loitering reporters and baseball decision-makers, Nationals General Manager Mike Rizzo insisted his roster doesn’t need more than some tweaking this offseason. His goal every winter is to build a team he believes is capable of winning 90 games. He believes these Nationals are close to, if not already at, that target. But Rizzo also said that a year ago. Then he nearly traded for Chris Sale, which would’ve created the scariest troika of starting pitchers in recent history, before he settled on acquiring Adam Eaton, an under-the-radar star, from the White Sox. Tweaking may be all that’s necessary, but history shows tweaking is not Rizzo’s go-to winter pastime. Eleven months later — after Eaton tore his anterior cruciate ligament, after Michael A. Taylor finally capitalized when given a chance to play every day, after Brian Goodwin emerged as a legitimate big-league player, and after Victor Robles continued his rapid ascendance — the Nationals have a logjam in the outfield, one that Rizzo could pick from if he has the itch to go beyond tweaks again. As currently constituted, the Nationals’ starting outfield would be Eaton in left field, Taylor in center field and Bryce Harper in right field, Rizzo confirmed on Monday. But that’s if a game were played in mid-November. Opening Day is in four-and-a-half months. “There’s a lot of things that can happen,” Rizzo said. One of those potential things is, obviously, a trade. In addition to Goodwin, Robles and the starting outfielders, the Nationals have Andrew Stevenson and Rafael Bautista on the doorstep, and Daniel Johnson and Juan Soto, two of their top 10 prospects, further down in the farm system. Washington is, by far, deepest in the outfield. “We like the outfield options that we have and they’re all good, talented players and a lot of them are young and cost-controlled, which is important to us,” Rizzo said. “We feel that it’s an area of depth for us but a lot of them are young and farther away. So we think we’re in a good position.”