Jaguars Football

Running back Corey Grant carries the ball during the Jacksonville Jaguars rookie minicamp on Saturday, May 9, 2015, in Jacksonville, Fla.

(AP Photo)

Nick Marshall flipped sides of the ball and jersey numerals at the Jacksonville Jaguars' rookie minicamp this weekend. A quarterback who wore No. 14 at Auburn, Marshall was a cornerback who wore No. 41 at the NFL team's rookie workouts.

The Jaguars signed Marshall as a college free agent after he went unselected in the 2015 NFL Draft. The Jacksonville coaching staff worked with Marshall in January while guiding the South team at the Reese's Senior Bowl in Mobile, where he made the move from quarterback to cornerback.

"They just helped me get back into defensive-back shape, showing me the fundamentals again at defensive back," Marshall said. "I was kind of rusty, but I started getting better each day."

That connection with the Jaguars was one of the reasons that Marshall signed with Jacksonville over offers from the Baltimore Ravens, Cincinnati Bengals and New York Jets.

"(Jacksonville coach Gus Bradley) made me feel comfortable with him because he liked my approach," Marshall said in a video interview for the Jaguars' team web site, "how I came up to him and told him I wanted to try another position. And I'm very competitive, and he likes competitive guys, so that's what I'm here for."

As a college free agent, Marshall knows his hold on a roster spot is tenuous.

"I just need to do what I came here to do and what they brought me here for and be brought back in next week," Marshall said.

Bradley said Marshall had what the Jaguars like in cornerbacks.

"I think his length, his size and weight and his athleticism are all attributes that we're looking for at that position," Bradley said after the Jaguars' first practice on Friday. "Sometimes you like a guy that really has bought into it. He's bought into it, really wants to play corner. So we'll see what we got."

Cornerback isn't a new position for Marshall. He played there as a freshman at Georgia before making the switch to quarterback at Garden City Junior College. Marshall was Auburn's starting QB for the previous two seasons, throwing for 4,508 yards and 34 touchdowns and running for 1,866 yards and 23 touchdowns.

"When you play one spot and then move to another," Marshall said, "you've got to take, I'd say, like a week or two to get back into it and then it'd be just like natural to you."

College free agents usually face an uphill climb to make an NFL roster, but the Jaguars don't have any cornerbacks that were first- or second-round draft picks.

"You can do anything if you put your mind to it," Marshall said. "I'm just going to be here and bust my tail, whatever they want me to do."

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Marshall wasn't the only former Auburn player at Jacksonville's rookie minicamp as a college free agent. Running back Corey Grant participated, too.

Grant turned heads with his 40 time at Auburn Pro Day, but he hopes to get an opportunity to show speed is only part of his package.

"When I was at Auburn, I wasn't really given a chance to run between the tackles," the former Opelika High School star said after practice on Friday. "I was always given a speed sweep or a quick pass. So I have (the ability), it's just I haven't shown it enough for people to realize it."