ComplexCon returns to Long Beach Nov. 6 - 7 with hosts J. Balvin and Kristen Noel Crawley, performances by A$AP Rocky and Turnstile, and more shopping and drops.

Secure your spot while tickets last!

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. 

Send all complaints, compliments, and tips to sportstips@complex.com.