However, Arnette remains on the injured reserve list.
Brown, 27, is a former seventh-round pick of the 49ers back in 2015. He was traded to the Patriots in 2018 in a pick swap.
Brown played out the final year of his four-year, $2.28 million contract before agreeing to a record four-year, $66 million deal that includes $36.75 million guaranteed with the Raiders last offseason.
In 2020, Brown has appeared in two games for the Raiders and made two starts at right tackle.
Arnette, 23, was a three-year starter at Ohio State and earned second-team All-Big Ten honors last season before being selected by the Raiders with the No. 19 pick in the draft.
Arnette signed a projected four-year, $13,418,540 rookie contract that includes a $7,318,938 signing bonus. The contract includes a fifth-year for the Raiders to pick up for the 2024 season.
In 2020, Arnette has appeared in three games for the Raiders and recorded 12 total tackles and one pass defense.