Texans veteran offensive tackle Duane Brown skipped a pair of organized team activity practices due to displeasure with his contractual situation, according to league sources with knowledge of the situation.

It's unclear when or if the three-time Pro Bowl blocker will report after being absent from voluntary practices Monday and Tuesday. Brown can't be fined unless he misses a mandatory minicamp in June.

"Nothing," Texans coach Bill O'Brien said when asked if he could shed any light on the absence of the Texans' top offensive lineman.

Brown has two years remaining on his six-year, $53.4 million contract extension that includes $22.081 million guaranteed, a $12.5 million signing bonus and an average annual compensation of $8.95 million.

Brown is due nonguaranteed base salaries of $9.65 million and $9.75 million in 2017 and 2018. That would rank him 11th in 2017 and 12th in 2018 among left tackles in terms of cash compensation.

However, the Texans generally don't renegotiate contracts with two remaining years.

If the Texans are inclined to renegotiate, they have several relatively salary-cap friendly options available to them. That could include potentially guaranteeing all or part of the remainder of Brown's contract, converting a portion of the base salary for this year into a signing bonus and adding future years to the deal to spread out the annual salary-cap proration.

Brown is the leader of an offensive line that has obvious question marks at right tackle and the guard positions. That's where his potential leverage lies in any prospective negotiation as the lone proven commodity across the line.

Brown, 31, is entering his 10th NFL season and is a former first-round draft pick from Virginia Tech. He made an impressive comeback last season from a torn quadriceps tendon and was named a Pro Bowl alternate.

"It's different," Texans backup tackle Kendall Lamm said when asked about Brown not being on the field. "You have to continue going. Duane's my man. I can't wait to see him out here with us, but you got to continue."