NEW YORK -- Clint Frazier continues to gain momentum as he recovers from a concussion sustained in the Yankees' second spring game, manager Aaron Boone said on Thursday.
Frazier, who has experienced a variety of issues since crashing into the left-field fence at LECOM Park in Bradenton, Fla., on Feb. 24, participated in a simulated game on Thursday at the Yankees' Player Development Complex in Tampa, Fla.
"Hopefully now in the next couple of days he's starting to get into game action and he can start his Spring Training game-wise, and continue to progress," Boone said. "Things are finally starting to ramp up for him, which is really good news."
Though Frazier came into the spring facing an uphill battle to make the big league roster, given what was believed to be a stacked outfield mix, the 23-year-old likely would have received an opportunity had he been healthy.
The Yanks are currently short-handed in the outfield, with Jacoby Ellsbury (left hip), Aaron Hicks (right intercostal) and Billy McKinney (left shoulder) all on the disabled list.
As a result, Boone said the club is going forward with Giancarlo Stanton, Brett Gardner and Aaron Judge as the everyday starters, though Ronald Torreyes and Tyler Wade have been taking practice reps.
"We continue to kind of evaluate that every day," Boone said. "We worked through it quite a bit after [Wednesday's] game. Tyler Wade was getting some work in center field already. He's kind of our protection there. Toe will continue to bounce around a little bit out there. It will be something that we'll evaluate each day, but right now this is how we're going forward."
Hot corner
The Yankees were pleased with Miguel Andujar's improving defense this spring, rewarding the 23-year-old prospect with his first Major League start at third base on Thursday against the Orioles.

"I'm excited to see him play," Boone said. "He played so well in spring on both sides of the ball that we're very comfortable putting him out there and looking forward to him getting his first start in the field under his belt. Hopefully he can go out and contribute to us winning the game."
Ranked as the club's No. 4 prospect by MLB Pipeline, Andujar is the No. 3 third-base prospect in the game and the No. 65 prospect in all of baseball.
"It's a chance to get Miggy in there, a chance to get some at-bats, especially with the potential of coming up in the next series with the [Red Sox] lefties," Boone said.
Staying sharp
Torreyes impressed with both his bat and glove in Wednesday's 7-2 victory over the Rays, knocking an RBI single while saving a run for starter Luis Severino with a deft first-inning catch in shallow right field.
The plays came after Torreyes sat out the Yanks' first five games of the season, but adhering to a solid pregame routine has allowed the valuable utility man to keep his edge.
"You definitely need mental toughness," Torreyes said through an interpreter. "The important thing is once you get the opportunity, you want to be ready to play. Although I am not playing in those games, I feel like I'm playing because I'm in the game mentally, every pitch and every at-bat. It helps me prepare for whenever the opportunity comes."

Torreyes also provided some levity for his teammates near the end of the afternoon contest, when the swirling winds delivered a large plastic bag to his position at second base.
"You guys saw all the trash being blown on the field; I think he got attacked by a bag there at the end," catcher Austin Romine said. "You never count Toe out. He's going to make plays that most people don't make. He's always locked into the game, he's always ready to play when his name gets called, and it just speaks to him as a player that he's always ready to play."