From what I've researched, no one wore number 21 for the San Diego Chargers in 1998.
Junior Seau!
Two noteworthy players have sported number 68 for the San Diego Chargers: Defensive end Leroy Jones (1976-83) and Pro Bowl guard Kris Dielman (2003-11).
Ryan Leaf.
RB Glen Bonner.Bonner wore #21 for the Chargers in 1974 and 1975.
George Roberts
Ryan Matthews
Most players never wore a chargers uniform.
running back for the San Diego Chargers football team he now plays for the jets of the 2010 season He wore number 21 for the chrgers
They wore their blue, home game uniforms on January 17th.
1980 - WR John Jefferson 1984 - TE Bobby Micho 1985-1986 - WR Trumaine Johnson 1988-1993 - WR Anthony Miller
Wide receiver Lance Alworth, who was inducted to the Pro Football Hall of Fame in 1978 primarily for his years with the San Diego Chargers (1962-70), wore No. 19 for the Dallas Cowboys in 1971 and 1972.