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.
|Ceferin dismisses "super league" plans as fiction|
|Rams defeat Chiefs in one of the highest scoring games in NFL history|
|Kemba Walker leads Hornets to win over Celtics|
|Gomez praises ´top player´ Van Dijk, Stones|
|Cricket Australia to maintain Smith, Warner ball tampering bans|
|Brazil´s Tite encouraged by Neymar captaincy|
|Holmes set for NFL switch after Cronulla release|
|Dier encourages English youngsters to follow Sancho´s lead|
|Southgate promises further changes to England squad|
|Jones sceptical over Pocock injury|
|Sane encouraged despite Germany´s ´annoying´ Nations League draw|
|Character got Netherlands through, says Koeman|
|Netherlands´ focus still on Euros - Van Dijk|
|Ireland will be ready for qualifiers, insists O´Neill|
|Smith undergoes successful surgery, Redskins sign Sanchez|
|Germany 2 Netherlands 2: Dramatic five-minute fightback seals Oranje progression|
|Denmark 0 Republic of Ireland 0: Thrills at a premium again in Aarhus|
|O´Brien could return for start of Six Nations|
|Cavani: Neymar and I are ´friends, brothers, team-mates´|
|Pothas named Windies interim head coach|
|LA Galaxy planning for Ibrahimovic stay|
|NFL will return to Mexico City in 2019|
|Broner vows to end Pacquiao´s career in Las Vegas|
|UEFA should punish PSG and Man City, says LaLiga chief|
|Teenage driver Floersch has ´no fear of paralysis´ after operation|
|Mancini bemoans Italy´s misfortune in front of goal|
|Sprint legend Johnson ´pretty much back to normal´ after stroke|
|Bournemouth defender Adam Smith out for three months|
|World champions France out to end 2018 on a high|
|I told him there´s no future in football! A-Rod relieved to be ignored by Mahomes|
|Dembele must focus and be more responsible - Suarez|
|Neymar could return one day – Barca chief|
|Cole backs West Ham to keep Arnautovic|
|Injury rules Bernardo Silva out of Poland clash|
|Lamar Jackson debut start ´spectacular´ - Ravens coach Harbaugh|
|Babar run out the turning point, laments Sarfraz|
|West Ham boost London Stadium capacity to 60,000|
|A great advertisement for Test cricket - Williamson revels in stunning win|
|Van Dijk one of the world´s best - Klaassen|
|Floersch had ´angel on her shoulder´ in horror crash|
|Gascoigne charged with sexual assault|
|I am going to stay at Chelsea and fight, insists Giroud|
|Hansen to make announcement on All Blacks future|
|I have reached the top by joining Chelsea - Sarri|
|Bonucci tells Italy boo boys to ´live with less envy´|
|Dramatic Pakistan collapse gives Stead first New Zealand Test win|
|Button enjoying racing for first time in years|
|Dortmund chief not planning Pulisic sale|
|Theismann: Smith leg break ´heart-wrenching´ to watch|
|Wolves defender Jonny suffers knee injury|
|Holmes to meet with Sharks amid NFL switch talk|
|LeBron made 51 points ´look easy´, says Walton|
|McGuire signs four-year deal with Cowboys|
|Bears beat Vikings to extend NFC North lead|
|Peng overcomes Davis in Houston final|
|Kerr says this has been his toughest stretch as Warriors coach|
|LeBron scores 51 in Lakers´ win, Warriors fall to Spurs|
|Win more than Djokovic? Let´s chill out – Zverev|
|Steelers´ rally highlights wild day of close, last-minute finishes|
|Modric not worried about Ballon d´Or|
|Saints pull away for blowout victory over Eagles, extend winning streak to nine|
|Martinez laments loss of control by Belgium|
|Logano claims first NASCAR Cup championship|
|Luis Enrique delighted with attitude of Spain´s squad|
|Stevens tells Celtics to get ´tougher´|
|Griezmann: Being Messi´s lieutenant played a part in rejecting Barcelona|
|Curry proud of how Warriors handled Green-Durant incident|
|Courtois: Belgium thought Nations League job was done|
|Howell ends 11-year title drought to deny record-breaking Rodgers|
|Robben dismisses Bayern title talk|