Less than a day after calling his team captain "heroic," USC head coach Steve Sarkisian told reporters that the school is investigating whether Josh Shaw injured himself saving his drowning nephew.

Sarkisian gave a statement Tuesday morning explaining that the school had received phone calls that contradicted the story Shaw told his coach over the weekend. Here's the story USC released on its website:

While attending a family social function at his cousin's apartment in his hometown of Palmdale, Shaw looked on from a second floor balcony to the pool below and saw his 7-year-old nephew, who cannot swim, in distress without help nearby.  Shaw instinctively leaped off the balcony, landing painfully on the concrete below.

He was able to crawl into the pool and ushered his nephew to safety.  Despite the intense pain in his legs, he was then able to grab the ladder and lift himself out of the pool with his upper body.

Sarkisian said that Shaw's history gives him no reason not to believe what he was told, but the school will investigate the story to find out the truth. The senior is out indefinitely until the matter is cleared up and his status for the season opener against Fresno State is uncertain.

Watch what Sarkisian told the media:

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