Chargers give WR Allen four-year extension

The San Diego Chargers have agreed to terms with wide receiver Keenan Allen on a four-year contract extension. Allen was on the final year of his rookie contract.

The Chargers made the announcement late Friday. The deal is worth more than $44 million, sources told ESPN's Adam Caplan.

The deal is expected to be finalized and signed next week. Allen, the NFL's rookie of the year in 2013, has 215 receptions for 2,554 yards and 16 touchdowns in his first three NFL seasons.

Allen had 67 catches for 725 and four touchdown catches last season through eight games and was well on his way toward his second 1,000-yard season, but he suffered a kidney laceration in that eighth game and missed the rest of…