"I just like what they've said to me so far," Johnson said of the trio. "And it seems like I'll be a good fit at those schools."
"Those are my Top 3, not my Final 3," the 5-foot-10, 200-pounder said. "I'm still open to other schools recruiting me."
Johnson has visited most of the schools in Texas.
"I think the chances are pretty high that I will get out to Iowa," he said. "I want to see what it's like there."
LeVar Woods is leading the way for the Hawkeyes' recruitment of Johnson. The senior is ranked as the No. 64 cornerback in the country by Scout.com.
"I think Iowa has a great program," Johnson said. "I like how they've sent DB's to the league constantly for like the last 6-7 years."
Johnson isn't pressuring himself with a set decision date.
"I'm not sure when I'll commit," he said. "Whenever the time is right and I feel that I've done all my research and had all my questions answered, I will."