ESPN's Adam Schefter reported yesterday evening that Detroit Lions all-time leader in receptions and receiving yards is calling it a career after nine seasons. Calvin Johnson notified coaches and players after the season that 2015 was likely to be his last in the NFL.

Johnson reportedly told friends and family members before the season that 2015 was perhaps his last.

Johnson has suffered a number of injuries over his career. He has chronic ankle soreness and hand issues due to injuries he's experienced.

There's no doubt that Johnson is still at the peak of his game. Johnson had 88 receptions for 1,214 yards and nine touchdowns. This was Johnson's 7th season with at least 1,000 yards receiving and his sixth consecutive.

Philadelphia Eagles v Detroit Lions
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Earlier this season there were trade and retirement rumors swirling around Johnson's future. With the majority of his career on a losing team, it reminds us of another former Lion that retired early in his career. Johnson, like Lion's all-time leading rusher, Barry Sanders, will be retiring at the age of 30.

This leaves us thinking about what could've been with Calvin Johnson. Imagine if he had been on a winning team, perhaps the New England Patriots, the numbers he would have at this point would be astronomical.

Do you think Johnson is retiring too early?