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Kathy Willens/Associated Press

While we're almost four months removed from the conclusion of the 2013 NFL season, the failures and lackluster campaigns of certain teams and players still linger and remain fresh in the public consciousness. And as a result, a number of NFL stars have a lot to prove in 2014.

The players who made this list did so for a multitude of reasons. Some had their work ethic and love for the game called into question, which means a sterling 2014 will be needed to eradicate those doubts. Others put forth their worst campaign in years and missed the playoffs as a result. And in the case of two stars, perceived "down" seasons have led to others challenging their titles as best in the league at their position.

The good news for those listed here is that 2014 provides a fresh opportunity to either bounce back or once again show the world why they were considered the best in the league at what they do.

Here are the NFL stars with the most to prove in 2014.