Joey Bosa's agent said contract language and structure is holding up the No. 3 overall pick's deal.
Chargers G/C Chris Watt is recovering from arthroscopic knee surgery.
Chargers coach Mike McCoy said Melvin Gordon (knee) looked fully healthy at minicamp.
First-round DE Joey Bosa was not present for the start of Chargers mandatory minicamp on Tuesday.
NFL Network's Ian Rapoport reports Keenan Allen received $20 million fully guaranteed on his four-year extension.
Chargers signed WR Keenan Allen to a four-year extension through 2020.
NFL.com's Conor Orr reports the Chargers and contract-year WR Keenan Allen are discussing a four- or five-year extension.
Chargers signed second-round TE Hunter Henry to a four-year contract.
Melvin Gordon (knee) has taken part in some team drills at Chargers OTAs.
ESPN's Eric Williams believes the Chargers want to retain contract-year ILB Manti Te'o.
Chargers FB and Navy graduate Chris Swain will be eligible to play football in 2016.
Philip Rivers said at Chargers OTAs that he believes Keenan Allen "figured out last year what it took to be a No. 1 receiver in this league."
Philip Rivers confirmed Matt Slauson will be the Chargers' starting center.
Melvin Gordon (microfracture) is participating in individual drills at OTAs.
Chargers CB Brandon Flowers said he's 10-12 pounds lighter than he was at this point last year.