Joessar committed to the Rebels Monday, becoming the third commitment for the class of 2013. He joins Sunrise Christian Academy teammate Sebastian Saiz, who committed to Ole Miss in October.
Both players, as well as Piney Woods, Miss., forward Dwight Coleby, are expected to sign with Ole Miss on Wednesday on the first day of the early signing period, which runs through Nov. 21.
"Ole Miss was on him early," Sunrise coach Kyle Linstead said of Joessar. "(Ole Miss head) Coach (Andy) Kennedy came out here to talk to him in person. I think they developed a relationship with him.
"When Sebastian went there, and the European connection, I think it helped here. I think they wanted to continue their careers together. Him being with a high school teammate helps."
Saiz, a 6-foot-9, 230-pound forward, committed to Ole Miss in October. He transferred to Sunrise this year, after playing for the Spain 18-and-under team last season.
The 6-foot-7, 200-pound Joessar averaged 12.3 points and 6.7 rebounds in 2011 in the U-18 European Championships; this after posting 12.3 points and 8.3 rebounds in 2010.
Before moving to the United States, he played for Spanish Side CAI Zaragoza.
"They're going to work together well," Linstead said of Joessar and Saiz. "They like each other, they're great friends. They have that European connection. They've been teammates here at Sunrise.
"Sebastian's a hard guy to guard, and Janari knows it. They understand how good together they can be. I feel confident about both of these guys moving forward to the next level."
Joessar, originally from Estonia, didn't participate in AAU basketball this summer. However, that didn't stop a number of colleges from showing interest. "He had a long list," Linstead said, with a lot of attention coming from Big 12 and Big 10 teams.
Linstead said Joessar's relationship with Kennedy, as well as his official visit, separated Ole Miss from the pack.
"I asked him how the visit went. He said ‘Coach, I love that place. I love it there.' He really enjoyed it," Linstead said. "Coach Kennedy and staff really made him feel welcome and made it feel like home. He's really excited to continue his career at Ole Miss."
Ole Miss runs an up-tempo style of offense. Linstead said Joessar's fits in well, chiefly due to his ability to get to the rim and shoot for a guard his size.
"He's going to surprise people with his athleticism," he said. "It's kind of like you're getting two players in one. You're getting a kid that can get to the rim, but you're also getting a shooter. He can knock shots down. He's pretty athletic. That's what's going to shock people.
"He's a high-flyer. He's a shooter, and he's put on a lot of muscle since he's been here. He's going to be a nice player. I can see him being a balanced player once he fits into the style."