San Francisco 49ers tight end Vernon Davis explained the rationale behind his absence from the team's voluntary offseason workouts in a guest column he penned in Sports Illustrated's MMQB.

It is not clear if Davis will show up for the start of the 49ers' mandatory minicamp, which begins on Tuesday.

If Davis is not present, he is considered a holdout and the team can fine him.

"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."

In a radio interview last week, Davis said he plans to be at the team's minicamp. He made similar comments in an interview with on June 5.

"If it's mandatory, I think I should be there," he said. "My foot could get stuck in the grass, and I may not be able to get out ... but if it's mandatory, I think I should be there."

Davis accounted for 13 of the team's 21 receiving touchdowns in 2013, not including two key touchdown catches in the postseason. He became the first tight end in league history to have two seasons of 13 touchdowns.