Tommy Armstrong was a quarterback at Nebraska, a running back to start Vikings’ rookie minicamp and now he’s a safety.

Armstrong told the Pioneer Press he practiced at safety during Sunday’s final day of the three-day camp and the Vikings are looking to sign him to a contract to continue playing that position during offseason workouts.

“I’m invited back to OTAs (organized team activities) with the team,’’ Armstrong said. “I’m excited about it.”

Armstrong did not sign a contract entering the weekend, but the Vikings often have signed players after tryout camps while releasing others to stay at the offseason roster limit of 90. General manager Rick Spielman, whose Vikings begin OTAs on May 23, did not return a message Sunday night.

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The Loop Fantasy Football Report: Week 2 “I met with (defensive backs coach Jerry) Gray after practice Sunday, and he said, ‘We’re going to fly you back up here (next) Sunday and we’ll give you a playbook,’’’ said Armstong, who returned on Sunday night to Lincoln, Neb. “He said he’d call me in a few days. They also like the way I’ve been playing special teams.’’

The athletic Armstrong played the first two days of the tryout camp at running back before he was told by running backs coach Kennedy Polamulu. that Gray would meet with him Sunday morning and he would be looked at during the practice at safety. Armstrong played the position at Steele High School in Cibolo, Texas.

“I was kind of rusty at first,’’ Armstrong said of Sunday’s practice. “But I think that I can bring something to the team on the defensive side of the ball and to special teams. I’m looking forward to next week. I’ll do whatever it takes to play in the NFL.’’

Armstrong threw for 3,030 yards and 22 touchdowns for the Cornhuskers in 2015 and for 2,180 yards and 14 touchdowns last season. After leaving Nebraska, he was aware he would have to switch positions to land with an NFL team.

Armstrong isn’t the only Nebraska player from last season trying to make the Vikings. Running back Terrell Newby signed last week as an undrafted free agent, and Armstrong said Newby told him there is no risk he won’t continue with the team for OTAs.