49ers sign Vance McDonald to five-year extension

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The 49ers don’t have many players worthy of long-term extensions. They believe they have at least one.

Tight end Vance McDonald has signed a five-year extension. The team announced the deal, which puts McDonald under contract through 2021, on Friday night.

A second-round pick in 2013, McDonald was due to become a free agent in March.

“Vance has shown consistent growth throughout his four-year career and his production this season is the result of his dedication and hard work,” G.M. Trent Baalke said in a press release. “We believe he has only scratched the surface of what he will be able to accomplish in his career. Vance is a tremendous ambassador for the 49ers, and his passion for helping others provides a wonderful example for this organization. We look forward to his continued contributions to this organization, both on and off the field.”

McDonald has 10 starts in 10 appearances this season, with 24 catches for 391 yards and four touchdowns.

The deal reportedly is worth $35 million in new money, according to ESPN. The contract also carries $16 million guaranteed, which as we know by now means little without knowing how much is fully and actually guaranteed at signing.