SAN DIEGO (AP) — The San Diego Chargers aren’t asking any single receiver to replace Vincent Jackson, who signed a $55.5 million contract with Tampa Bay.

Quarterback Philip Rivers has plenty to work with in training camp after the Chargers imported four NFL veterans — wide receiver Robert Meachem and returners Eddie Royal, Roscoe Parrish and Micheal Spurlock — and retained Malcom Floyd and Vincent Brown.

Jackson led San Diego receivers last year in catches, yards and touchdowns — and had a 10-catch game with 172 yards receiving and two touchdowns at New England in September. The 6-foot-5, 231-pound Jackson could run past cornerbacks, bully safeties and bulldoze defenders as a blocker.

Meachem will try to give Rivers a deep threat after averaging 16.1 yards per catch the last four seasons with New Orleans.