Arian Foster was supposed to make his training camp debut on Sunday after being on PUP with a strained calf that has bothered him since May.

But, per the Texans on Twitter, Foster sat out the practice, not because of his calf, but due to a sore back.

Per the report, Texans coach Gary Kubiak said, he "expected him out there, but it didn't happen."

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Terry McCormick covers the Titans for TitanInsider.com