Russell Wilson made headlines before the season when he claimed Reliant Recovery Water helped prevent concussions thanks to its "nano bubbles." And a few months after Wilson was widely ridiculed for the statement, at least one NFL head coach has gone on record as saying he definitely isn't buying it. 

During a press conference Thursday in which Chip Kelly spent a good amount of time discussing cornerback Malcolm Jenkins and the revelation that he played in Sunday's game against the Cowboys with a concussion, the Eagles coach took a subtle jab at Wilson and any nano bubble disciples.

"There's people [that] say they drink a certain water and that helps them," said Kelly. "I don't think there's anything you can do [to prevent a concussion] unless you're teaching proper tackling techniques and things that from a technical standpoint to prevent it." 

Check out his comments below. 

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