Detroit Lions wide receiver Calvin Johnson has announced his immediate retirement from the NFL. Just a day after one of the all-time great quarterbacks, Peyton Manning, officially called it a day, Johnson, one of the NFLs best receivers, has also retired.The Lions revealed on Tuesday that the 30-year old has brought to an end a nine-year career with the franchise. I have played my last game of football. This was not an easy or hasty decision, said Johnson. I have put a lot of time, deliberation and prayer into this decision and I am truly at peace with it.I loved playing in Detroit and will forever be a Lion. My biggest regret is that I wasnt able to help give our fans a championship. Calvin Johnson (right) was the Lions first-round draft pick in 2007 Famously nicknamed Megatron, Johnson was the second overall pick in the 2007 NFL Draft and quickly established himself as one of the leagues top receivers.He retires having broken a considerable number of records, both franchise records with the Lions and all-time NFL records. Johnson also earned six consecutive Pro Bowl invitations between 2010 and 2015.Among them, he owns the NFL record for most receiving yards in a season. His 1,964 yards in 2012 broke the record held by San Francisco 49ers great Jerry Rice. Johnson appeared at Wembley last November, as the Lions were thrashed by the Kansas City Chiefs This record was considered all the more remarkable considering the Lions only reached the play-offs twice during Johnsons time in Detroit, once in 2011 and again in 2014.Johnson also holds the record of being the fastest player in NFL history to reach 10,000 receiving yards, taking just 115 games to reach the mark. He is also tied with Michael Irvin for the most games with over 100 receiving yards in a season, with eleven. Johnson struggled with a number of injuries during the past three seasons Rumours of his retirement began at the end of the 2015 season, with reports suggesting Johnson was leaning towards calling time on his career.That was after three seasons troubled by injury, including daily knee drains in 2013 to keep on playing. His 2014 year was blighted by ankle trouble, which persisted in 2015, although he was able to play in all 16 of Detroits games. NFL Ins & Outs Free agency opens on Wednesday - keep track here He still managed to finish the season with 88 catches for 1,214 yards, and nine touchdowns.Johnsons departure will save the Lions $11.1m in cap space. He walks away from a contract with $67.7m and four years left on it, which remains the largest-ever deal for a wide receiver. 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Dallas hasnt ruled out the star quarterback for Sunday nights game against Philadelphia, but all signs point to Romos back injury pushing Kyle Orton into the starting role after two years of limited play as the backup. Surely Ortons name isnt the first that comes to mind for fans wanting a change after years of damaging interceptions, fumbles or, most infamously, the field goal flub when Romo dropped the snap on a kick that could have won his first playoff game in 2006. Exeter picked up their first league win of the season with a deserved win over Harlequins at Sandy Park but their afternoon was marred by the sending off of replacement prop Tomas Francis for careless use of the boot.For the first 50 minutes, the Chiefs were in commanding form before falling away in the last quarter. They still scored five tries with hooker Luke Cowan-Dickie scoring a hat-trick. Lachie Turner also crossed twice with Gareth Steenson converting four and adding a penalty.Rob Buchanan, Danny Care and Charlie Walker scored tries for Quins with Tim Swiel kicking two conversions and two penalties. It was a second loss for the Quins in their three opening matches with only a narrow win over Premiership newcomers, Bristol, to their name.A leg injury to promising number eight Jack Clifford, which saw him helped from the field in the second half, compounded a miserable afternoon for Quins.Mitch Lees was a late withdrawal for the Chiefs with Damian Welch stepping up from the bench to replace him but Exeter soon overcame this setback by taking a lead in the sixth minute.An excellent run from Don Armand put the visitors defence on the back foot, which allowed Turner to force his way over from close range.Steenson missed the conversion before the hosts fumbled the restart and were penalised, which enabled Swiel to put Quins on the scoreboard.Minutes later, Swiel put his side in front with a second penalty before Exeter bungled a clear-cut opportunity to retake the lead when Ian Whitten failed to deliiver the scoring pass to Henry Slade as the wing chose to go it alone and was tackled just short of the line.ddddddddddddIt mattered little, as from the resulting line-out a wholly inaccurate throw went straight to Cowan-Dickie, who merely had to fall over the line. Steenson converted before Exeter hit their opponents with a brilliant third try.The Chiefs burst out of defence and clever play from Olly Woodburn handed a second try to Turner but the visitors remained in contention with a Buchanan try from a driving line-out.Swiel converted before Exeter picked up their bonus point when Cowan-Dickie drove over for his second try. Steenson converted and kicked a penalty to leave his side with a healthy 29-13 lead at the interval.After the restart, two lost line-outs from Quins soon allowed the home side to resume their dominance with Cowan-Dickie completing his hat-trick from another driving line-out.Quins threw on the cavalry with Dave Ward, Will Collier and George Merrick all introduced before Cowan-Dickie departed to rapturous applause from the home crowd.A raft of substitutions resulted in the game becoming disjointed with Exeter resting on their laurels to give the visitors more possession.This allowed a try for Care and one for Walker as Quins showed considerable spirit in the final quarter but despite a red card for Francis, they never looked like overhauling the Chiefs. ' ' '