CLEVELAND -- The Browns are on the clock with Alex Mack. Clevelands Pro Bowl centre signed a five-year, $42 million contract offer sheet with the Jacksonville Jaguars on Friday. The Browns, who have received official paperwork on the deal, are expected to match it and keep one of their best players. The Browns have five days -- until 11:59 p.m. on Wednesday -- to match Jacksonvilles offer or theyll lose Mack, who has not missed a single offensive play since the Browns drafted him in 2009. The club secured that right for the time to weigh the decision after placing a $10 million transition tag on the 28-year-old Mack before free agency opened. The deal includes $26 million guaranteed and would make Mack the NFLs highest-paid centre. The team entered free agency with re-signing Mack as one of its top priorities, and there doesnt seem any reason the Browns wouldnt lock him up for a few more years. Macks contract also has an option for him to void the deal after two seasons. Also, his team cant tag or trade him. Earlier this week, Browns owner Jimmy Haslam said he was confident Mack would remain with Cleveland. "We remain optimistic that Alex Mack will be a Cleveland Brown for a long time," Haslam said at the premiere of "Draft Day," a fictional film about the Browns. "We want him to be. I think weve made it very clear that hes the kind of person, the kind of player we want in our organization." Mack has played 4,998 consecutive snaps with the Browns. In 2011, Mack played despite a severe attack of appendicitis that landed him in surgery the following day. He has developed into one of the games top centres, lauded for his blocking ability, leadership and helping Clevelands quarterbacks read defences. With Mack in the middle and Pro Bowl tackle Joe Thomas on the left side, the Browns have one of the AFCs top offensive lines. They dont want to weaken one of their only strengths. "Obviously, weve made it kind of evident how important Alex is to this team, and whether its talking with (Pro Bowl tackle) Joe (Thomas) or talking with some of the other players, were all just hoping it gets resolved soon and hes back," quarterback Brian Hoyer said. "Obviously we have a new system to learn and hes the anchor of that offensive line." It would be understandable if Mack wanted to test the free-agent waters. The Browns have gone just 23-57 since he joined them in 2009, and Mike Pettine will be Macks fourth head coach in six years Mack reportedly enjoyed his visit with the Jaguars, who like the Browns, have been stuck in a cycle of losing. But the teams offer to Mack is a strong sign of its intention to upgrade its roster and revamp one of the leagues worst offensive lines. The Jaguars selected left tackle Luke Joeckel with the second overall pick in last years draft and signed former Denver guard Zane Beadles in free agency last month. 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Argos general manager Jim Barker uttered those words during an interview with TSN 1050 radio just prior to the CFLs annual free agent frenzy.Flushing, NY (SportsNetwork.com) - The Oakland Athletics activated outfielder Josh Reddick from the 15-day disabled list prior to Tuesdays game against the New York Mets. In order to reinstate Reddick, the As placed first baseman Kyle Blanks on the 15-day DL with a strained left calf. Reddick was 7-for-16 in a four-game rehaab stint with Triple-A Sacramento.dddddddddddd A hyperextended right knee put him on the shelf at the beginning of June. He was batting only .214 with four home runs and 22 RBI over 50 games prior to the injury. Blanks, acquired from San Diego in May, has hit .333 with two homers and seven RBI in 21 games with the As. 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