The Seahawks have been pleased with what they've gotten out of Cliff Avril over the past two seasons.

Therefore, on Friday, the Seahawks signed Avril to a four-year extension worth $28.5 million, according to a report from NFL.com. $16 million of the deal will be guaranteed.

Avril has played a big role in Seattle's success on defense. In 2013, he had eight sacks and five forced fumbles. With the defense coming out of a midseason slump, Avril has still managed to record 4.5 sacks and 20 total tackles. Just as important is how Avril has been a constant threat rushing the passer to force hurried throws.

The Seahawks have seemed to put everything together on defense at the right time of the season, with Avril playing a big reason as to why.

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Aaron Wilson covers the Ravens for The Baltimore Sun