Chelsea fans are being urged to arrive early at the Parc des Princes for Tuesdays Champions League match against Paris St Germain. Following the terrorist attacks in Paris last November where the France v Germany football match at the Stade de France was targeted, French police will conduct a huge security operation involving several thousand personnel. Theres heightened security for Chelseas last 16 Champions League tie with PSG. Sky Sports News HQ reporter Gerain Hughes is in France with more. The authorities want to learn how to best police large football crowds ahead of Euro 2016 in France this summer. The police and security services have already employed a number of new tactics at Frances two home Six Nations rugby internationals at the Stade de France, but have earmarked Chelseas visit to Paris as an opportunity to see how football crowds behave.Fans will encounter three layers of security before they can get to their seats with the police responsible for the first two layers outside the stadium while private security will perform further checks once fans have entered the stadium perimeter. Extra metal and explosive detectors will be used. Victoriano Melero, deputy chief executive of the French football federation told Sky Sports News HQ that these measures will be used at all Euro 2016 matches later this year. The Stade de France was targeted by terrorists last November The attacks last year changed a lot, Melero said. But we had a robust security programme in place already. What we are now doing is reinforcing it.All the partners are working together, the public forces, the police and private forces. We will have three layers of security outside stadiums. French authorities are to trial new security measures at Chelseas away game against Paris St Germain Euro 2016 will use 10 venues for the championships this summer. Tens of thousands of football supporters from the British Isles are expected to travel to France as England, Wales and Northern Ireland have all qualified as well as the Republic of Ireland.Ziad Khoury, head of security for Euro 2016 is confident the tournament will be safe: For the first time at a Euros a memorandum of understanding has been agreed between the Interior Ministry and Euro 2016 organisers, we are working well together, he said.I work for the Ministry, but am now here with the Euros, we are working very hard and I believe I can ensure the safety of supporters. 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LOUIS -- St. Embattled quarterback Mark Sanchez will sign with the Dallas Cowboys after being released by the Denver Broncos, a source told ESPNs Adam Schefter.Sanchezs deal with Dallas will be for one year, according to the source.Sanchezs future in Denver looked bleak after Broncos coach Gary Kubiak named Trevor Siemian his starting quarterback and had rookie Paxton Lynch take all the snaps in the teams preseason finale against the Arizona Cardinals.Broncos executive vice president of football operations/general manager John Elway said he had a long talk with Sanchez on Saturday morning as the veteran quarterback was being told of his impending release.I will tell you this ... he handled it with great class, Elway said. I know hes disappointed. He wanted to stay here and, you know, we just thought with where we are, we thought it was best for us to [go] different ways at this time. But Mark was great, and you know what? He handled everything great ... I thought he handled it great, and its just unfortunate he didnt win that job.Sanchez was traded to Denver by the Philadelphia Eagles in March.The Broncos save $3.5 million and a seventh-round draft pick by releasing Sanchez, who would have been owed $4.5 million for the season. The other $1 million is guaranteed but with offsets. The Broncos now will have to pay only that portion that exceeds whatever the Cowboys will be paying him, up to $1 million.Sanchez was 20-of-30 passing for 219 yards and one touchdown, with one intercepttion, in two preseason appearances, including a start in the preseason opener in Chicago.dddddddddddde lost two fumbles in the closing minutes of the first half of the preseason game against San Francisco, meaning he had three turnovers in 46 snaps on the field.The Broncos did quickly add a veteran quarterback to the mix when they signed Austin Davis.Davis, a fifth-year veteran who started eight games for the then-St. Louis Rams in 2014, was released by the Cleveland Browns this past week when rosters league-wide went to 75 players.Elway reaffirmed Davis is coming on board to help mentor Siemian and Lynch -- neither has thrown a pass in a regular-season game -- and that Siemian is the Broncos unquestioned starter.Hes coming in to learn the offense, Elway said. ... Trevors the guy, weve got a lot of confidence in Trevor and know he can do the job. Its Trevors job, and hes not going to be looking over his shoulder. Hes got a lot of support, and Trevor earned the job. Im excited about him -- Im excited to see him play.Aside from Sanchez, the Broncos parted ways with 21 other players, including three other veterans with extensive regular-season experience: RB Ronnie Hillman, DL Henry Melton and FB/RB Juwan Thompson.?ESPNs Dan Graziano and Jeff Legwold contributed to this report.?Information from The Associated Press was used in this report. ' ' '