MONACO -- Tire manufacturer Pirelli fears for its future in Formula One as time runs out to agree a new contract with teams for next season. Pirelli is currently the sole supplier to F1 but faces a mammoth task in designing and preparing new tires for 2014 -- which sees significant changes to F1 regulations and car design -- if a new deal is not struck soon. "Apparently on the first of September we need to tell them (the teams) everything they need to know about the tires for next season," Hembery said after Thursdays second practice session at the Monaco Grand Prix. "But were now mid-May, so you can imagine how ludicrous that is when we havent even got a contract in place." Hembery would not disclose the deadline set internally for an agreement. "Maybe we wont be here (next year) anyway," he said. "At a certain point somebodys got to make a decision. Weve been trying to say that something needs to happen and quick." The Italian companys three-year contract with F1 expires at the end of 2013 and Hembery had hoped a new deal would already have been sealed. But the situation continues to drag on and motor sports governing body, the FIA, has yet to say if or when other manufacturers will be allowed to bid. "Things are getting, as far as we can see, extremely serious," Hembery said. "The changes next year are so substantial that the sport has to make a rapid decision, because aside from having the fixed resources in the business involved in F1, theres also the technical job." He added that "there comes a time where we will not have time to do the job any more" such is the complexity of next years switch from 2.4-litre V8 engines to turbo-charged 1.6-litre V6s. "Its not a case of maybe putting a harder compound onto thiIs years tires. The changes are so dramatic that we probably need to do a thorough re-engineering of the tire," Hembery said. "That takes time and the longer this goes on it makes our job impossible, and there comes a point where probably you say well, we dont have time to do the job." It has been a very difficult few weeks for Pirelli, which has faced severe criticism because its tires have been shredding too easily. Three-time defending champion Sebastian Vettel has been one of the most outspoken, complaining after the Spanish Grand Prix two weeks ago that tires were influencing races more than the pace of the cars. Vettel, who finished fourth in Barcelona, pointed up the recent problems when he spoke to reporters on Thursday. "When the majority of the drivers are struggling it means that you cannot drive as you are used to -- and probably this should be given a thought or two. If your only focus is the tires, then that is not racing any longer in the way that we knew. " The Spanish Grand Prix saw nearly 80 pit stops, with most drivers shelving plans for three stops and taking four because the tires were shredding too easily. Pirelli responded with a pledge to start making changes to their rear tires as from next months Canadian GP. While it remains to be seen what alterations will be made for Montreal, Hembery is optimistic an agreement can be reached with the 11 teams on that front at least. "Were very close to having an agreement with all the teams, which is really important," he said. "We want to get rid of the delamination that we found has been caused by cuts in the tire, debris-induced which creates a weak spot and overheating. Weve been able to replicate that now in our laboratories, and our internal testing, and we believe the solution we have will completely resolve that." Jackie Robinson Jersey .35 million, one-year contract that avoided salary arbitration. 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LAS VEGAS -- The New England Patriots remain the top team in the NFL Vegas Rankings, but the Seattle Seahawks have moved ahead of the Dallas Cowboys into the No. 2 spot.The Patriots, even with the loss of Rob Gronkowski, keep rolling along. They beat the Los Angeles Rams 26-10 as 13.5-point home favorites and are the 2-1 Super Bowl favorites at the Westgate Las Vegas SuperBook.The Seahawks, who had taken a hit in our power rankings after their 14-5 loss at Tampa Bay in Week 12, bounced back with a resounding 40-7 rout of the Carolina Panthers as 8.5-point home favorites on Sunday night to vault back over the Cowboys, who beat the Minnesota Vikings 17-15 on Thursday night but did not cover as 3-point road favorites (note: the Cowboys are the No. 2 team in the Super Bowl futures at 7-2 with the Seahawks at 9-2).The NFL Vegas Rankings are compiled using the average of the power ratings from Chalk handicappers Erin Rynning and yours truly, Dave Tuley, along with ESPNs Football Power Index (FPI).dddddddddddd Theyre intended to compare the relative strength of teams if they were to meet on a neutral field and what the point spread should be for those matchups. Weve also added the FPI and Massey-Peabody rankings to our chart for comparative purposes and to show other viewpoints.Heres a look at the teams making the biggest moves up and down the NFL Vegas Rankings, and then well look for some Week 14 value plays using this weeks power ratings:Heres a look at the teams making the biggest moves up and down the NFL Vegas Rankings, and then well look for some Week 13 value plays using this weeks power ratings: ' ' '