HOUSTON -- Astros outfielder Justin Maxwell is day to day after doctors discovered a "loose body," likely a bone chip, in his injured left ankle in an MRI on Thursday.

Maxwell has been dealing with pain in the ankle all season, but left Wednesday's game after four innings with intense pain in the ankle.

"It's been bothering him off and on almost all year," manager Brad Mills said. "It got to the point that it was too bad. We had to get an MRI and go from there."

Mills said no one with the Astros knows just how to proceed with the injury, so they'll talk with Maxwell and evaluate it on a day-to-day basis. Maxwell didn't start Friday, but Mills said he was available as a pinch-hitter or defensive replacement.

Mills envisions playing Maxwell for a couple days and then sitting him to see how the ankle reacts. Mills also said the injury might linger through the rest of the season, and doctors will try to manipulate the bone chip if they can.

Maxwell is batting .233/.321/.475 with eight homers and 24 RBIs on the season. He had started in 13 of the last 15 games.

Miami native Martinez happy for Heat

HOUSTON -- Miami native J.D. Martinez taped a picture of LeBron James hoisting his NBA Finals MVP trophy to the top of his locker on Friday after James won his first title with the Miami Heat on Thursday.

Reliever Wesley Wright quickly pulled the picture down while Martinez was away. Martinez said Wright is one of many Astros players who were rooting against the Heat.

"This has been going on all year," Martinez said. "Everyone hating on the Heat. Being from Miami, I have to stand up for them, so I've been sticking up. Now it's my day where I get to talk trash a little bit."

He said he watched Game 5 against the Oklahoma City Thunder at Jed Lowrie's house with a couple of other teammates.

"They laugh at how into I get," Martinez said. "Part of being a fan."

Worth noting

• Beau Mills, son of manager Brad Mills, was traded from the Indians to the Reds on Thursday. The Astros' manager said he thinks a change of scenery could be good for Beau, who was the 13th overall selection in the 2007 First-Year Player Draft.

A first baseman, Beau hit .267 in six Minor League seasons with the Indians' organization. At Triple-A Columbus this season, he hit .197 with seven homers and 21 RBIs. He will report to Double-A Pensacola in the Reds' organization.

• Outfielder Travis Buck, on the disabled list since May 29 with right Achilles tendinitis, will alternate between outfield and designated hitter with Double-A Corpus Christi through Monday. The Hooks started a four-game series at Frisco on Friday.

• Traffic could be heavier than normal after the Astros-Indians game at 3:05 p.m. CT on Saturday due to the USA-Italy rugby match being held at BBVA Compass Stadium at 7:30 p.m.

Fans with parking passes will be able to park in Minute Maid parking lots starting at noon. The Astros don't anticipate any major issues.