The Seahawks Monday signed DE Cassius Marsh, their third-round draft choice, and added two players from the weekend’s rookie camp — OG Nate Isles (6-5, 348) of North Carolina A&T and TE Rashaun Allen (6-4, 250) from Southern University in Baton Rouge, LA.

The report on NFL.com for Allen from the school’s pro day:

“Ran the 40 in 4.66 and 4.69 seconds. He had a 38-inch vertical jump and 9-foot-7 broad jump. Short shuttle in 4.52 seconds and three-cone drill in 7.40 seconds. He looked good catching the ball, and is probably a priority free-agent pickup following the draft.”

The report on Isles from tonysoftli.com:

“He’s a big body who had a very good game against the big bodies at Appalachian State and shows the build, physical tools, and overall strength to potentially surprise people. He was never really looked at by all-star games and should have competed in the Medal of Honor Bowl but somehow went unnoticed. While he likely won’t get drafted he could ideally be a right tackle or potentially a guard in the NFL. He should be a priority free agent.”

The signings bumped two players from the Seahawks’ 90-man roster: TE Travis Beckum was a former New York Giant whom the Seahawks signed as a free agent Feb. 10, and CB Jimmy Legree was signed last week as an undrafted free agent.

Marsh is the fourth among Seattle’s nine draft picks to sign. The list includes fifth-round DT Jimmy Staten, sixth-round DB Eric Pinkins and seventh-round FB Kiero Small. The collective bargaining agreement now slots draft picks’ compensation at fixed amounts, so there is little negotiation and holdouts are unlikely.