INDIANAPOLIS -- Robert Mathis season is over before it even began. Less than two weeks after leaving the Colts to start serving a four-game suspension for violating the leagues performance-enhancing substance policy, coach Chuck Pagano said team doctors confirmed their worst fears: The 2013 NFL sacks champion tore his Achilles tendon during a private workout in Atlanta. Pagano said he believed Mathis was scheduled to have surgery Thursday. The more muddled question is about Mathis return. Yes, Mathis defied the odds last year when, at age 32 and without his longtime friend and teammate Dwight Freeney on the opposite side, produced a franchise record 19 1/2 sacks and became the inaugural winner of the Deacon Jones Award. But the long road back could be a tough one. "I would say that Achilles injuries are one of the toughest injuries to deal with because they are less predictable then say an ACL," said Dr. Mark Drakos, who specializes in foot and ankle disorders at the Hospital for Special Surgery in New York and is a former Harvard football player. "Not a lot of studies have been done on this, but one of them shows about 31 to 32 per cent of guys who get this injury never play in the NFL again. Part of that is a selection bias, but the point is its tough to come back from." Drakos is not treating the 6-foot-2, 245-pound Pro Bowl linebacker. When Mathis came out of Alabama A&M in 2003, most teams thought he was too small to survive in the NFL. When the fifth-round draft pick then emerged as one of the leagues best pass rushers, many thought it was because Freeney was helping from the other side. When he moved to linebacker, at age 31, some questioned his coverage skills. Along the way, though, Mathis persevered, making it to six Pro Bowls and breaking Freeneys franchise record with 120 career sacks. Kobe Bryant and Terrell Suggs are examples of players who have come back from Achilles surgery. However Drakos believes it could be a bigger significant challenge for a 34-year-old pass rusher who relies so much on speed. "He had a phenomenal year last year, and usually you think an older athlete will have a slow decline," Drakos said. "But we expect (a torn Achilles) to happen more in older players, and it can affect their explosiveness." Trevor Williams Jersey . -- Stanley Johnson scored all 18 of his points in the second half, T. Justin Jones Jersey . However, Therrien added that Galchenyuks status for next Wednesdays game against the Detroit Red Wings is questionable. Galchenyuk has been out since Jan. 6 with a broken right hand. http://www.officiallosangeleschargersfoo...y-jersey-womens. This weeks topics include his take on the Kevin Pillar incident, All-Star snubs, the firing of Padres general manager Josh Byrnes and more. Hunter Henry Jersey .C. -- Charles Oakley, one of the NBAs all-time tough guys, may not return to the Charlotte Bobcats bench next season because of a painful back condition he says was caused during an assault last year in Las Vegas. Brandon Mebane Jersey . -- Thirty years ago, the Detroit Pistons beat the Denver Nuggets 186-184 in triple overtime, a game that remains the highest scoring in NBA history.Borussia Monchengladbach have had a £14.25m bid for Andreas Christensen rejected by Chelsea, according to Sky in Germany. The Bundesliga club are keen to bring the 20-year-old Denmark international defender to Germany on a permanent basis after he impressed during the first year of a two-year loan spell with them last season.Christensen made 39 appearances for Monchengladbach in the 2015/16 campaign and scored three goals. His loan will continue, although no further talks between the clubs over a permanent move are expected until the winter. Conte: Costa must stay Chelsea head coach says striker is happy at Stamford Bridge Christensen has made one Premier League appearance for Chelsea as a late substitute in their 3-1 win over Sunderland in May 2015 as well as starting two cup games earlier that season.dddddddddddd Meanwhile, Chelsea head coach Antonio Conte has has denied suggestions Diego Costa could be on his way back to Atletico Madrid, claiming the striker is happy to stay at Stamford Bridge. Also See: Conte: Costa must stay Zouma feeling good Top 20 summer transfers so far Get a £10 free bet! 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