Greenard said Missouri was the most serious school and stayed in touch until, "I made it clear to them I wasn't switching from my Louisville commitment."
And after an official visit last weekend, Greenard is glad he made the decision to commit and stick with it for the Cardinals.
"It was such a great experience," he said. "I was there in the summer for camp, so I was able to talk to them before. But I wasn't able to see all the school buildings and stuff. I talked to (athletic director Tom) Mr. Jurich and I met a lot of people.
"I spoke to the entire staff, I loved it. I'm solid (to Louisville)."
The 6-foot-4, 220-pound Greenard said he "really likes" watching Tood Grantham's defense and has been told that he's a "perfect fit" for what the Cardinals need. He's expected to come in and battle for the open outside linebacker spot.
"Coach Grantham and coach Petrino both said I need to keep working out and eating and do a lot of flexibility work," he said. "They said I might be able to play early on.
"(Lorenzo) Mauldin and (Deiontrez) Mount are leaving and those positions are up for grabs, so I just have to come in and work hard. They didn't make any promises, but they talk like I could come in and get some early playing time."
Greenard had a sensational senior season at Hiram, netting eight sacks on the season. He finished his career with 13 sacks.
"I missed the record for one sack on the season, but I had the record for career," he said. "I just can't wait to get there now. I just need to keep my grades up and work out."