Vernon Davis detailed why he believes he deserves an extension from the San Francisco 49ers.

"In 2010 I signed a five-year, $37 million contract extension with $23 million guaranteed. It was the biggest contract for a tight end in league history," Davis wrote. "Four years later, and I'm playing at a higher level than I was then, which brings me to why I'm holding out. It's all about getting paid what you deserve. It's not that complicated. I want the 49ers to win the Super Bowl, and I want to be on the field this summer working towards that goal, but I have to worry about my future first."

Davis' stance on Monday appears to contradict what he's said in the past. On Thursday, he told a San Francisco radio station: "You know what? I plan on being there. I plan on being there."