NEW YORK (Reuters) - The New York Yankees ended a two-game losing skid Tuesday but had some negative news on injuries to two key players -- slugger Alex Rodriguez and pitcher Andy Pettitte, the club said.

Rodriguez is expected to miss a few games at least due to a strained calf muscle that sent him out of Monday's game in the fourth inning, Yankees manager Joe Girardi told reporters.

The third baseman, who recently became just the seventh player in Major League Baseball history to reach the 600 career home run mark, is listed as day-to-day.

Pettitte, who like A-Rod had an MRI test done on Tuesday, had some swelling in the left groin injury that already had put him on the disabled list and he will not be allowed to throw off a mound for a week, the manager said.

Girardi said the setback to his veteran lefthander, who has a sparkling 11-2 record this season, meant he was not expected to rejoin the Yankees until some time in September.

New York beat the Detroit Tigers 6-2 Tuesday to keep pace with the Tampa Bay Rays atop the American League East.

(Reporting by Larry Fine, Editing by Steve Ginsburg)