The 49ers begin their offseason program Tuesday, and it is uncertain whether tight end George Kittle and linebacker Fred Warner will show up to the voluntary workouts, Michael Silver of TheAthletic.com reports.

The questions regarding George Kittle’s future with the 49ers can be put to bed. On Tuesday, the 31-year old inked a four-year, $76.4 million contract extension that includes $40 million guaranteed with San Francisco,

There has been some uncertainty as to whether three of the team's biggest names will attend the voluntary offseason program.