"It's definitely in play, but let's get through today," Boone said before the Yankees' 1-0 loss to the Seattle Mariners.

Stanton, Donaldson and Kahnle all played in a rehab game for Double-A Somerset on Tuesday. Donaldson went 1-for-4 in his fourth rehab game as he comes back from a strained right hamstring, and Stanton was hitless in three at-bats in his first appearance since injuring his left hamstring on April 15. Kahnle pitched one inning, giving up one run and one hit, and walking two.

Boone said he wasn't concerned about Stanton potentially returning after playing in just one rehab game. He did say that Stanton likely will be just a designated hitter for a couple of weeks after rejoining the Yankees.

"We'll kind of build him up outfield wise in his pregame and things like that, but initially just DH," Boone said.

Donaldson has been out since April 6, and Kahnle has yet to pitch in the regular season due to right biceps tendonitis.

Anthony Rizzo was out of the lineup Wednesday for a third straight game due to a stiff neck, but Boone said he expected Rizzo back in the lineup Friday. Rizzo was hurt in Sunday's win over the San Diego Padres during a collision with Fernando Tatis Jr.