AP

The Cardinals have all three of their second-day draft picks under contract.

The team announced Thursday on its website that it had signed Notre Dame tight end Troy Niklas (Round Two), North Carolina defensive end Kareem Martin (Round Three) and Pittsburg State wide receiver John Brown (Round Three).

Niklas (6-6, 270) caught 32 passes for 498 yards and five touchdowns for the Fighting Irish in 2013. He looks likely to compete for immediate playing time in Arizona.

Martin (6-6, 272) earned all-ACC honors in 2013, notching 82 tackles and 11.5 sacks. He projects as a reserve on the Cardinals’ three-player defensive line this season.

Brown (5-10, 179) caught 61-1,198-14 in his final collegiate season. Brown, who returned three punts and two kickoffs for touchdowns in three seasons at Pittsburg State, could have roles on offense and special teams for the Cardinals.

The Cardinals now have four unsigned draft picks, including safety Deone Bucannon, their first-round selection.