Due to the salary cap and rookie contracts, not every NFL player is paid what he deserves. These seven players are underpaid and should be in line for big raises. Derek Carr: He only makes $1.3 million per year despite being an MVP candidate, but that'll change soon. David Johnson: Because he was a third-rounder, Johnson's salary is just over $729K per year. DeAndre Hopkins: The Texans would like to work out an extension since $1.9 million isn't enough for a Pro Bowl WR. Tyler Eifert: When healthy, he's one of the best tight ends in the game, proving that in 2015. Khalil Mack: The Defensive Player of the Year is in line for a Von Miller-type payday in the next year or so. Aaron Donald: The Rams picked up his fifth-year option, but the All-Pro DT deserves a lucrative extension. Xavier Rhodes: With Desmond Trufant getting paid, Rhodes should be next in line for top-tier cornerbacks.