The 2015 Minneapolis De La Salle point guard said it was a surprise to get the call from coach Tom Izzo.
"I told him I was really interested in Michigan State and I was kind of surprised knowing I hadn't played as well as I could have in Sacramento," Johnson said. "It showed how much interest he had in me. …
"He said he wanted me to be a Spartan."
The 6-foot point guard said he already had a lot of interest in the Spartans.
"I had a lot of interest in them actually," he said. "I kept in touch with Coach DJ (Stephens) during the season before and I talked to them last summer so I was pretty familiar with them.
"I always watched college basketball, so I saw them on TV a lot this year."
Johnson already was planning an unofficial visit to East Lansing and hopes to take one in the near future. He might choose to make a decision by the end of summer.
He claims no top group and is "pretty open" with no established favorite schools at this time.