"It's a bone bruise, it's gonna go away," Girardi said before the Yankees' 6-2 victory over the Atlanta Braves on Monday night. "Is it another day after today? It's possible. Do I expect to have him in the next couple days? I do."
Girardi said Swisher has made a big improvement since Sunday. The right fielder suffered the injury while sliding into home plate Saturday and needed to get stitches as a result. Girardi had hoped to get Swisher into the lineup Monday, but the manager said he will not be available.
"I went out and took some swings today, but it's not quite there yet," Swisher said through a team spokesman.
Swisher will undergo further treatment Monday, the spokesman said.
The 31-year-old is hitting .262 with 10 home runs and 40 RBIs for the Yankees, who extended their winning streak to 10 games Monday night.
Andruw Jones started in right field in place of Swisher and went 0-for-4 with three strikeouts.
In other news, Yankees left fielder Brett Gardner (right elbow) said he thinks he'll be able to return to the major leagues in four weeks -- or right around the All-Star break. He has been on the DL since mid-April.
Gardner has attempted two minor league rehab assignments, only to be shut down both times. He received a cortisone shot and platelet-rich treatment last Thursday.
"I think we have missed him. We've missed his ability to create runs, we've missed his defense in left field. I'm looking forward to getting him back," Girardi said.
Right-handed reliever David Aardsma tweeted that he will start in the Gulf Coast League Yankees' home-opener on Tuesday.