This isn't the start of training camp that veteran defensive end Mario Williams had envisioned.

Williams has a foot injury that prevented him from practicing, according to the Buffalo News.

“Mario reported to our athletic training staff that he had a sore foot,” coach Doug Marrone said. “So what we wanted to do was hold him out of practice and let our medical staff evaluate him.”

No information was disclosed on how Williams injured his foot. The former top overall pick of the draft with the Houston Texans, Williams dealt with a wrist injury last season while playing in every game. His impact hasn't been quite what was expected, but the Bills don't sound like they're having buyer's remorse just yet.

“It’s not a disappointment from a standpoint of, ‘Gosh, I wish the player was out here for the rest of the team.’ It’s more of a disappointment for the individual,” Marrone said. “Mario’s put in a lot of hard work, went in the playbook and did a lot of work this offseason."

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Aaron Wilson covers the Ravens for The Baltimore Sun