NFL Network's Ian Rapoport reported on Tuesday that Kittle and the 49ers agreed to terms on a four-year, $76.4 million extension that will make him the league's highest-paid tight end. The 49ers entered the day with $39.4 million in cap space, not accounting for any potential changes to Kittle's cap number with his new contract.

The $76 million deal heading George Kittle's way is an important line in the sand for the San Francisco 49ers.

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