Linebacker Rob Jackson scores a touchdown in the first quarter to tie the game at 7. (Tony L. Sandys/The Washington Post)

The Washington Redskins and outside linebacker Rob Jackson have an agreement in principle to bring him back to the team for another season, according to a person with knowledge of the situation.

Jackson was set to become a restricted free agent on Tuesday, but his representatives and the Redskins were able to come to terms on a one-year deal – not the restricted free agent one-year tender.

The terms of the deal were not immediately available because the two sides were still hammering out the final details, a source said. It was expected that the contract would be finalized by Sunday morning if not sooner.

Jackson is coming off of a career year in which he started 14 out of 16 games and made  37 tackles, 4.5 sacks and four interceptions – one returned for a touchdown – and two forced fumbles. The 6-foot-4, 266-pound Kansas State product moved into the starting lineup after Brian Orakpo tore a pectoral muscle in the second game of the season.

A seventh-round pick in 2008, Jackson has appeared in 42 games in his career, serving primarily as a backup until this season.

It’s believed that the one-year deal is more cap-friendly than the restricted free agent tender of roughly $1.3 million, but it still gives Jackson the flexibility to earn a bigger contract next season.

He will become the third restricted free agent to work out a deal with the Redskins prior to Tuesday’s start to free agency. Earlier on Saturday, tight end Logan Paulsen and fullback Darrel Young both agreed to three-year deals.