The Washington Redskins added necessary depth for their defensive line when they agreed to a contract with veteran end Arthur Jones.

A source said the Redskins would make the signing official by Wednesday morning, but Jones had posted a photo of himself on his Instagram account signing papers while at the team’s facility. Wednesday, the Redskins will place safety Stefan McClure on injured reserve to create the roster spot for Jones, multiple sources said. They have 12 offensive linemen on the roster, but with so many injuries they felt forced to carry that many. The Redskins typically keep eight or nine.

If one of their healthy starters will be playing this week -- whether left tackle Trent Williams, guard Brandon Scherff or center Spencer Long -- it would enable them to release one of the extra linemen.

The Redskins needed more depth along the line with Jonathan Allen (Lisfranc) on injured reserve and Matt Ioannidis (fractured hand) out for at least this week. That left them with only four defensive linemen on the roster. Allen and Ioannidis had started the season as their primary linemen in their nickel package, providing an interior push the Redskins haven’t had in a while.

That’s why they needed someone who could help them in their nickel package. Jones, 31, was released by Indianapolis in March after three disappointing seasons. He played in 17 games for the Colts, missing all of 2015 with an ankle injury. He played in eight games last year, missing four while suspended for performance enhancing drugs. Jones underwent hernia surgery in the offseason.

Jones landed a five-year, $33 million contract with the Colts because of what he did in Baltimore. Jones played his first four seasons with the Ravens, appearing in 44 games during his final three years -- and starting 20 of them. He recorded a combined 8.5 sacks his last two years with Baltimore.

Jones, whose brother Jon is an MMA fighter, did make some off-field noise this summer in California at the UFC 214 early weigh-in. There was a confrontation with members of MMA fighter Daniel Cormier’s team. Nothing physical happened, but Jones told MMAfighting.com that if it had, “I would have ragdolled all six of them -- for the record.”