A few practices into Jimmie Ward's career at Northern Illinois, Huskies head coach Jerry Kill realized the lightly recruited defensive back was not to be taken lightly.
"When he came in as a freshman it didn't take long to see, 'Geez, he's pretty damn good,' " said Kill, now at Minnesota. "And I think we all thought that if he put weight on, with the way he ran, he would get an opportunity to play at the next level."
Four years later, Ward is at the next level.
And history could be repeating itself.
Two training-camp practices into his NFL career, the 49ers' first-round pick has looked - to borrow from Kill - pretty damn good.
On Thursday, in one-on-one drills at the start of the noncontact practice, he debuted by reaching around wideout Stevie Johnson to bat down a quick slant. He later made a diving interception after cornerback Chris Cook deflected an over-the-middle pass from Colin Kaepernick.
He was fast, active and his aggression made it easy to see how he developed a reputation as a strong hitter at Northern Illinois despite his unimposing 5-foot-10, 193-pound frame.
Ward didn't participate in the offseason program after undergoing foot surgery in March, but his first NFL practice came last week when the rookies, quarterbacks and injured veterans reported. Still, many of his new teammates hadn't seen the cornerback in action until Thursday.
First impressions? Safety Antoine Bethea, an eight-year veteran, said Ward's play inspired some chatter.
"Like a lot of guys said on the sideline, he's always around the ball," Bethea said. "That's one thing you see in film of him in college, (he's) making plays. And yesterday making a good interception."
Said Ward of his pick: "If I keep making plays like that I'll be seen and, hopefully, I'll get some playing time."
Ward has taken some snaps at safety in his first two practices, but the 49ers drafted him to fill an immediate need at slot cornerback, a spot handled since 2011 by now-Raiders cornerback Carlos Rogers.
In June, defensive coordinator Vic Fangio said Ward "wouldn't look good early" in training camp because he was sidelined during the spring. Ward is still playing catch-up, but Fangio has been encouraged by his confidence and commitment.
"I like him mentally," Fangio said. "I think he's confident without being cocky or arrogant. I think he knows he's got a daunting task ahead of him, that he's been put behind the eight ball with no offseason work.
"I think he's ready to work. I think he's very coachable. He's ready to fight through the growing pains. I think everything about him emotionally and mentally will end up being on the plus side of his ledger."
Ward's first practice also included some of those growing pains. On two occasions he covered physical wide receiver Anquan Boldin, an 11-year veteran who routinely gives smaller cornerbacks the rag-doll treatment. Ward experienced that firsthand.
"He gave me a good swim move," Ward said, laughing. "He put his strength on display. So I know how to play him tomorrow."
Despite his non-BCS school background, the NFL stage doesn't appear to be too big for Ward, who was stunned in high school when he only received one Division I offer.
Now, after starring in college, he believes he can do the same with the 49ers - just as soon he masters the defense.
"I would say I was (nervous) more about the things I need to know and what I have to do," Ward said Thursday. "But football comes easy. ... It's really just trying to learn a new playbook."
Eric Branch is a San Francisco Chronicle staff writer. E-mail: ebranch@sfchronicle.com Twitter: @Eric_Branch
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Jimmie on Boldin