Richard Sherman has called on the NFL to dismiss the new helmet rule immediately, branding it "idiotic" during a Twitter outburst on Sunday.
NFL owners approved the introduction of the rule, which means it is a foul for any player to lower their head and initiate contact with their helmet against an opponent, back in May.
The policy change – which will see a 15-yard penalty called on the offender, with the referees also having the option to eject the culprit – was made to improve player safety, though it has led to confusion during the preseason.
Sherman - preparing for his first season with the San Francisco 49ers after he was released by the Seattle Seahawks - made clear his feelings on the subject on social media.
The cornerback began with a tweet that included a post from Brett Tessler, an NFL agent representing 49ers running back Raheem Mostert, who was penalised for a tackle made in a game on Saturday.
Tessler questioned an unnecessary roughness call against his client for leading with the head, with Sherman claiming it was impossible not to lead with the head when attempting a challenge.
"To all those ppl [sic] including those who made the rule. I want a video of YOU running full speed and being lead by anything but your head while also attempting to bring down a moving target," he wrote. "You will soon realise it's impossible."
There is no “make adjustment” to the way you tackle. Even in a perfect form tackle the body is led by the head. The rule is idiotic And should be dismissed immediately. When you watch rugby players tackle they are still lead by their head. Will be flag football soon.— Richard Sherman (@RSherman_25) August 19, 2018
He then continued to air his views in a further tweet, stating: "There is no 'make adjustment' to the way you tackle. Even in a perfect-form tackle the body is led by the head. The rule is idiotic and should be dismissed immediately. When you watch rugby players tackle they are still lead by their head. Will be flag football soon."
Sherman also posted a link to a YouTube video of tackle being made in rugby, making note of how such a technique was considered ideal for that sport, yet "would be a for sure penalty in our league".
The 49ers have two more preseason fixtures - against the Indianapolis Colts and Los Angeles Chargers - before they open their regular season campaign against the Minnesota Vikings on September 9.
|Messi to return for Argentina next year - General manager Burruchaga|
|Walton salutes LeBron after he surpasses Chamberlain|
|Croatia´s Dalic and Modric not out for Spain revenge|
|Rondo to miss ´a few weeks´ with broken hand|
|Gabi, Juanfran hopeful over Oblak´s Atletico future|
|England rookie Wilson not comparing himself to Kane|
|WATCH: The baskets that moved LeBron James up the all-time NBA scoring list|
|LeBron moves into fifth on scoring list, 76ers fall in Butler´s debut|
|LeBron James into top five NBA scorers: Five quotes from league legends on his greatness|
|LeBron passes Chamberlain for fifth on all-time scoring list|
|Butler: 76ers need time to gel|
|South Africa lose 28-9 in Windies defeat|
|Delph impressed by ´special´ Sancho|
|Bolt may give up on football career despite ´a lot of offers´|
|We´re better than Dortmund – Wagner urges Bayern to respond|
|Raptors fans give former coach Casey standing ovation in return|
|Martinez hails Hazard leadership|
|Muller going through ´difficult´ period, says Low|
|Betances wants Yankees to sign Machado|
|Rays´ Snell, Mets´ deGrom win Cy Young Awards|
|Dinwiddie to debut Stan Lee-inspired shoes against Heat|
|Iberostar Tenerife and Segafredo Virtus Bologna stay perfect in BCL|
|Rooney wanted to finish career at Manchester United|
|Red Sox give manager Cora contract extension through at least 2021|
|WATCH: Ronnie O´Sullivan hits blue with calamitous break-off shot|
|Matuidi: Mbappe has a great personality, like Ronaldo, Messi and Zlatan|
|Cilic beats Isner to hand Djokovic semi-final spot|
|Mendy undergoes knee surgery|
|Warriors´ Curry will not play during three-game road trip|
|Ramos refuses to retaliate after Lovren jibe|
|Qatar pull off shock win over Switzerland|
|Tuilagi could make England return against Australia|
|Rooney has earned England reward - Sarachan|
|Croatia thrashing means nothing now – Luis Enrique|
|Chelsea and Everton among Arnautovic suitors, claims agent|
|TJ Watt hopes to win NFL sacks race with brother JJ|
|Modric defends Ramos after Lovren comments|
|Southgate hails ´outstanding´ Delph as he talks up England strength in depth|
|No war with Manchester United over Fellaini, insists Martinez|
|Rooney to wear number 10 shirt against USA and receive armband from Delph|
|I don´t feel pressure of Liverpool expectations, claims Klopp|
|Steelers´ Roethlisberger texted Bell but ´didn’t hear back´|
|Reus and Kroos to sit out Germany´s clash with Russia|
|Van Dijk happy to recommend De Ligt if Liverpool ask|
|Sauber announce launch of junior programme|
|No ´breathtaking tennis´ in Djokovic´s win against Zverev|
|Curran: England spinners will be key in Kandy|
|Djokovic charges past Zverev to move closer to ATP Finals progression|
|Messi is a football alien - Malcom|
|Sky´s the limit for Sancho, says Dortmund team-mate Pulisic|
|Radwanska retires from tennis at 29|
|Maybe one day - Pulisic open to Premier League move|
|Suso ´proud´ of Real Madrid speculation but happy at AC Milan|
|Betis president convinced Lo Celso will stay|
|Injured Holder out of Bangladesh tour|
|Germany face relegation, final spots up for grabs - Nations League state of play|
|James Rodriguez out for several weeks with knee injury|
|Curran´s brilliant fifty rescues England´s innings|
|Lenglet: No problem with Dembele at Barca|
|Townsend rings the changes for Springboks clash|
|Claudio Ranieri´s managerial career in Opta numbers|
|Mahmudullah´s first century in eight years boosts Bangladesh|
|Fellaini gets the chop ahead of 31st birthday|
|Maradona: Solari will not last at Real Madrid|
|Molinari: Race to Dubai success would not surpass Ryder Cup glory with Fleetwood|
|Dortmund star Sancho was a Bayern target, confirms Salihamidzic|
|Gerrard enjoying ´buzz´ of management|
|Hamilton questions approach to Formula One expansion|
|Ranieri honoured to lead ´exceptional´ Fulham squad|
|Solari saw Isco out of shape - Ceballos|