Video: Marshall locked up for five years

Marshall Agrees To Extension With Dolphins (1:04)

Adam Schefter on Brandon Marshall's contract extension (1:04)

ESPN's Adam Schefter reports the Miami Dolphins already have signed receiver Brandon Marshall to a four-year extension worth $47.5 million. This is in addition to the one-year qualifying offer he signed Tuesday, bringing the Dolphins' commitment to $50 million over five years, in addition to the two second-round draft picks they spent to get him. Marshall's deal includes $24 million in guarantees.

Depending on how you count the money, Marshall can be considered the highest-paid receiver in NFL history. Arizona Cardinals star Larry Fitzgerald also averages $10 million a season.