CINCINNATI -- Ken Griffey Jr. strained his right biceps on a swing Wednesday night, then homered on the next pitch and left the game.

	Griffey

The Reds outfielder missed 5½ weeks after dislocating his right shoulder while trying to make a diving catch on April 5. He returned before the shoulder was completely healed, and was starting to hit the ball hard consistently when he had the setback.

He fouled back a one-strike pitch from the Yankees' Mike Mussina in the fifth inning, and strained his arm on his follow-through. He winced in pain and gingerly rolled the shoulder, bringing a trainer and manager Bob Boone from the dugout.

They talked to him for a few seconds and decided to leave him in. Griffey hit the next pitch into the seats in right field for his seventh homer, but held the right arm carefully at his side while rounding the bases.

He used his other arm for high-fives when he got to the dugout, then headed for the trainer's room after talking to Boone.

Griffey hit a tying solo homer in the ninth inning last Friday, then another in the 11th inning for a 4-3 victory over Florida, his best game since returning from the shoulder injury.

His solo shot on Wednesday was the 475th of his career, tying Willie Stargell and Stan Musial for 22nd on the career list. He has 33 career homers against the Yankees.

Griffey has missed 140 games while on the disabled list over the last three seasons. He tore a hamstring during spring training in 2001, then tore a tendon in his knee during the opening week of the 2002 season.