SANTA CLARA, Calif. -- The San Francisco 49ers retained a key depth piece last week when they re-signed linebacker Brock Coyle.

Coyle, 27, played an important role after injuries and changes at linebacker last season and served as a core special-teams player. As a reward, the Niners gave him a three-year, $8.5 million with $4.1 million in guarantees.

Included in the deal is a $2.1 million signing bonus as well as a fully guaranteed base salary of $900,000 in the first year.

Here's a full breakdown of the deal courtesy of ESPN Stats & Information:

2018

Salary-cap charge: $2.05 million

Base salary: $900,000 (fully guaranteed)

Signing-bonus proration: $700,000

Per-game roster bonus: Up to $400,000 ($25,000 per game on 46-man active roster)

Workout bonus: $50,000

Notes: Deal also has up to $1 million in not-likely-to-be-earned incentives based on playing time.

2019

Salary-cap charge: $3.2 million

Base salary: $2.05 million ($1.1 million guaranteed for injury only, becomes fully guaranteed on April 1, 2019)

Signing-bonus proration: $700,000

Per-game roster bonus: Up to $400,000 ($25,000 per game on 46-man active roster)

Workout bonus: $50,000

Notes: Deal also has up to $1 million in not-likely-to-be-earned incentives based on playing time.

2020

Salary-cap charge: $3.15 million

Base salary: $2 million

Signing-bonus proration: $700,000

Per-game roster bonus: Up to $400,000 ($25,000 per game on 46-man active roster)

Workout bonus: $50,000

Notes: Deal also has up to $1 million in not-likely-to-be-earned incentives based on playing time.