The England and Wales Cricket Board has again spoken to England captain Alastair Cook following his decision to defy new regulations and wear an old-style helmet. Officials from the ECB contacted Cook on Thursday to remind him of the new regulations after he refused to wear a helmet which meets new safety rules.Cook scored 105 and 35 not out in Essexs 10-wicket victory over Gloucestershire in their opening County Championship Division Two match this week. It is understood the umpires at Chelmsford and the ECB were aware that Cooks helmet failed to meet the new regulations, but chose not to enforce the new rules.New helmets which comply to British Safety Standard BS7928:13 have a smaller gap between the peak and grille and are not adjustable on each side.The rules were changed after numerous high-profile injuries, including to Stuart Broad and Craig Keiswetter, when a cricket ball penetrated beyond the helmets protective grille. Alastair Cook strides out to the crease at Chelmsford If Cook continues to use the Gray-Nicholls helmet, both county and Test umpires can ask him to leave the field.Cook has been made available for Essexs first four County Championship matches and is due to play next against Sussex at Hove on Sunday.He is due to lead the England team out again in the first Test against Sri Lanka at Headingley on May 19.Cooks Essex and England team-mate Ravi Bopara sympathises with anyone having to readjust to the new helmet style, but believes too that safety has to be paramount.I admit it myself, it is tough to start using those helmets - you do lose the ball for that less than a split-second, and that makes a whole load of difference to a lot of players, Bopara told Sky Sports News HQ. Ravi Bopara explains why Alastair Cook does not want to use a specific style of helmet. It makes them feel uncomfortable. So I understand where Cookies coming from. But when it comes to the guidelines and safety, we all have to be aware of that.Over a career, a batsman naturally becomes accustomed to the view of the ball his preferred helmet allows.Bopara added: Because of the safety aspect, with everything that has happened ... we are told we have to wear the helmets that meets the standard guidelines.It is difficult for players to change helmets like that, because you get so used to wearing a certain one which youre comfortable with - and you have your visor as wide as you want it.But the problem with the new helmets is you cant move the visors - youve just got to look at the hole thats there.Sometimes, that bar that goes across can get in the way. Also See: Giles extends Lancashire deal Derbyshire borrow Fletcher Best of Buttler Hicks Australia role Nike Air Max 270 Triple Black For Sale . 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RIO DE JANEIRO, Brazil -- Derrick Rose missed the first NBA game played in South America on Saturday, sitting out the Chicago Bulls 83-81 victory over the Washington Wizards with soreness in his surgically repaired left knee. The NBA stars absence disappointed a sellout crowd of 13,635 at the HSBC Arena in Rio -- the gymnastics venue at the 2016 Olympics -- where the top ticket price for the preseason game was 2,000 Brazilian reals ($915). Taj Gibson led the Bulls with 18 points and Luol Deng added 14. Bradley Beal paced Washington with 16. Rose had played two preseason games without any sign of problems, but Bulls coach Tom Thibodeau said the knee flared up in practice Friday and Rose ended his work about halfway through the session. "We wanted to see where he was today, but he wasnt as well as we would have liked," Thibodeau said. "He still had the soreness. So we anticipated giving him time off. We view our training camp as the entire month. So if he needs a day, or a couple of days well do that." Kirk Hinrich started at point guard in Roses absence and finished with eight points and three assists. "Its more, I think, just a precaution. Hes coming off a really big injury. Were not too worried," Hinrich said. "Hes been good all camp and Im assuming everybody is expecting him to be ready. "Coming back from a big injury like that, you dont want to push it too hard, too fast." Chicaggo led 44-35 at halftime and was in control most of the way until Washington took a 79-77 lead with 5:42 left on Glen Rices 3-pointer.dddddddddddd Fans started chanting late in the game "Rose, Rose," hoping to see him take the floor, but Thibodeau plans on playing it safe with his star point guard. "In training camp when guys get sore, you usually rest them," he said. "You are always concerned with injuries or soreness. We knew coming into the season hes coming off a major injury." Rose hoped to be ready for the Bulls next game, at home Wednesday against the Pistons. "I know that I should be ready to go next game," he said. Chicagos Joakim Noah also missed the game, sitting out with a groin injury. "Over the course of a season you are always going to have different issues in terms of health," Thibodeau said. "So we expect when someone is out, the next man will step up and get the job done. We had a lot of guys do that last year and we expect the same next year." Brazilian great Oscar Schmidt got a rousing welcome from the fans, but Wizards centre Nene, who grew up near Sao Paulo, was jeered as he took the floor. And he was jeered each time he went to the free-throw line. Many Brazil fans are unhappy because Nene seldom plays for the national team, and Schmidt has criticized him for not doing so. Chicago is 3-0 in the preseason and Washington is 0-2. ' ' '