Greg Bird, who has been out since Monday after suffering back spasms, said he is ready to play, but Joe Girardi isn’t going to start the left-handed hitting first baseman until Friday against Orioles right-hander Gabriel Ynoa.

“I was under the thought that it would be a couple of days. With back spasms it’s usually more than one day,’’ Girardi said before the Yankees’ 3-2 win over the Rays on Wednesday at Citi Field. “We will probably look at Friday against when we face a right-hander.’’

Girardi said he would use Bird as a pinch-hitter Wednesday, if needed, but he wasn’t.

The Orioles are scheduled to start lefty Wade Miley on Thursday when the O’s open a four-game series at Yankee Stadium.

After missing all of 2016 because of shoulder surgery Bird has played in just 33 games this season due to a right foot injury that he suffered in spring training and eventually required surgery.

Since coming off the disabled list on Aug. 26, the 24-year-old Bird has played in 14 games (11 starts) and gone 9-for-42 (.214) with two homers and 10 RBIs.

A sensational spring training led Girardi to hit Bird third on Opening Day. Now, having played in 33 games in the past two seasons, there are some who wonder if Bird’s body will allow him to be a lineup regular.

“I still think he is an everyday first baseman who can have a big impact, but obviously he has to stay on the field,’’ Girardi said. “When we have seen him healthy he has been very productive.’’

That was in 2015 when Bird got a chance to play due to a leg injury to Mark Teixeira and batted .261 with 11 homers and 33 RBIs in 46 games.